When Israel Moves in Faith, God Moves in Power

Fundamentally, the book of Joshua centers on faithfulness—God’s faithfulness to Israel and Israel’s faithfulness to God. Joshua’s speech at the end of the book encapsulates this theme within a single chapter by focusing on the necessity of mutual faithfulness in maintaining possession of the Promised Land. In fact, the entire book of Joshua tells a story in which faithfulness finds its truest meaning in the context of relationship. Faithfulness attains its fullest expression, not as a solitary virtue, but rather as one that thrives on reciprocity and shared commitment.

Faithfulness Through Covenant

While it is natural to examine themes by breaking them into individual parts, this approach risks separating concepts intended to operate together. It can be easy to read the story of Joshua and exclusively consider God’s faithfulness in keeping His promises, or, conversely, to focus exclusively on the need for Israel to remain faithful to the covenant. This divided approach does not, however, reflect how the author narrates the story of Joshua. Instead, the fulfillment of God’s promises is presented consistently in tandem with the steadfastness of Israel; faithfulness is not passive loyalty to a purely intellectual idea, but active commitment to participation.

In the very first chapter, God Himself says that Joshua will “cause this people to inherit the land that [He] swore to their fathers to give them” (Joshua 1:6).[*] From the outset divine and human faithfulness intertwine to form a partnership through which God acts. This reality is continued throughout the entire book: the priests set foot in the Jordan River, and God stops up the water (Joshua 3:15, 16); the people shout around Jericho, and God casts down the walls (Joshua 6:20). In the many ensuing battles God vows to “give over all of them, slain, to Israel” (Joshua 11:6). Consequently, Israel is described as going out to strike them and chase them “until [they] left none remaining” “just as the Lord said” (verses 8, 9).

This pattern of partnership continues as the narrative unfolds. God’s promises find their strength in Israel’s participation, and Israel’s conquests find their strength in God’s provision: “One man of you puts to flight a thousand, since it is the Lord your God who fights for you, just as he promised you” (Joshua 23:10). Israel’s faithfulness is not a parallel effort to God’s work, but a participation in it. When Israel moves in faith, God moves in power—not because He is constrained or unable to act unilaterally, but because He chooses to operate within the faithfulness of His people. In doing so, He both honors human agency and reveals His glory.

Faithfulness by Example

One of the most remarkable dimensions of this covenant faithfulness between God and Israel is its reciprocal nature. While God expects His people to uphold the covenant and remain faithful to His commands, He also holds Himself accountable to the commitments they make on His behalf. When the Israelite spies promised Rahab safety for herself and her household, God honored that agreement—even though it originated from human initiative rather than divine instruction (Joshua 2:12-20; 6:22, 23). In fact, God did more than tolerate Israel’s commitment to Rahab: He actively participated in ensuring that her life was preserved and that her lineage was incorporated into the messianic genealogy.

Later in Joshua, when the leaders of Israel mistakenly made a covenant with the people of Gibeon, God upheld that oath as well, commanding the Israelites to remain faithful to their word despite the deception through which it had been secured (Joshua 9:15-20). God could have justifiably dismissed this agreement as error in human judgment. Yet He chose instead to bind Himself to Israel’s word, as if it were His own. This posture reveals not only God’s respect for human agency but also His unwavering integrity and faithfulness to the covenant relationship. Psalm 15:4 describes the righteous person as one “who swears to his own hurt and does not change”—and remarkably, God Himself models this ideal. He does not expect His people to abide by a standard He is unwilling to embody.

God’s promises find their strength in Israel’s participation, and Israel’s conquests find their strength in God’s provision.

Faithfulness Amid Failure

In a world in which promises are easily broken, God demonstrates what it means to remain faithful, even when it costs. There is a profound sense of assurance in knowing that God dignifies human decisions made in good faith. Yet at times humans make choices that betray the covenant and sever their partnership with divinity. Yet amid human unfaithfulness God remains faithful because the existence of His faithfulness is not dependent on others.

When Israel breaks the covenant, the partnership is temporarily fractured. But God does not desert Israel. He chooses to work through their brokenness to draw them back to Himself. One such example is the story of Achan and the defeat at Ai.

Joshua 7:1 says that after Israel’s victory at Jericho, “the people of Israel broke faith in regard to the devoted things.” Achan violated God’s explicit command and compromised the entire community by taking items devoted to destruction. As a result, Israel suffered an unexpected defeat at Ai, and God declared, “I will be with you no more, unless you destroy the devoted things from among you” (verse 12). The partnership faltered, not because God withdrew His faithfulness arbitrarily, but because Israel’s disobedience broke the covenant conditions that upheld their relationship. It was Israel’s choice, not God’s, that brought disaster.

And yet, even in judgment, God’s faithfulness remains unchanged. He provides a path for restoration, leading Joshua to confront the sin, remove it from the community, and bring Israel back into right standing with Himself (Joshua 7:13). In this we see that God’s faithfulness does not guarantee unconditional blessing apart from covenant fidelity—but neither does it abandon His people when they fail. Rather, His faithfulness works ceaselessly to restore and reclaim.

The tension between divine faithfulness and human unfaithfulness finds a New Testament echo in Paul’s words to Timothy: “If we have died with him, we will also live with him; if we endure, we will also reign with him; if we deny him, he also will deny us; if we are faithless, he remains faithful—for he cannot deny himself” (2 Tim 2:11-13). God’s response to human choice respects the reality of that relationship. If His people choose to die with Him, He will grant them to live with Him; if they choose to deny Him, He will not force Himself upon them. But His character remains unchanged whether His people remain faithful or not; no matter who we are, He is the same. His faithfulness is not a fleeting reaction to human behavior, but a constant expression of His nature.

Faithfulness Beyond Israel

This covenant dynamic resonates beyond the narrative of ancient Israel and into the spiritual experience of God’s people today. In the New Testament we can find a parallel in the person of Jesus Christ: Christ’s faithfulness fulfills the redemptive plan of God, just as God’s covenant faithfulness drove the conquest in the book of Joshua. And just as Israel’s obedient faith appropriated the Promised Land, so believers today participate in salvation through the faith of Jesus. Thus, the same divine faithfulness that empowered Israel’s faith is still at work with the people of God.

Many theologians have debated how best to interpret the biblical phrase “the faith of Jesus”—whether it refers to Christ’s own faithfulness or the believer’s faith in Him. But perhaps when Scripture speaks of “the faith of Jesus,” it does not refer solely to either His faithfulness or our faith, but to both, woven together in a divine mystery. Christ’s unchanging faithfulness and our living faith in Him, echoing the pattern found in the story of Joshua, join together into an unshakable force that will ultimately triumph over all the powers of hell.

Christianity, then, is a profound union with Jesus Christ—a union in which our faith is in Him, His faithfulness is in us, and the two are inseparably intertwined. The stories in Joshua reveal faithfulness as a partnership defined by God’s unwavering respect for free will and His steadfast commitment to His character. Ultimately the journey of faith invites us to walk in Christ, reflecting the faithfulness that He has first shown and continues to share with us. The book of Joshua calls us not only to admire God’s faithfulness but to actively step into it—living faithfully with confidence in a God who never changes.

[*] Scripture quotations are from the Holy Bible, English Standard Version, © 2001 by Crossway a publishing ministry of Good News Publishers. ESV Text Edition: 2016. Used by permission. All rights reserved.