Biblical Context:
The preparation of the Israelites under Joshua's leadership is a pivotal moment in the biblical narrative, marking the transition from the wilderness wanderings to the conquest of the Promised Land. This event is primarily recorded in the Book of Joshua, chapters 1 through 5. Joshua, the successor of Moses, is tasked with leading the Israelites across the Jordan River into Canaan, fulfilling God's promise to Abraham regarding the land.

Leadership Transition:
Following the death of Moses, God commissions Joshua as the new leader of Israel. In Joshua 1:2-3 , God commands Joshua, "Moses My servant is dead. Now therefore arise, you and all these people, and cross over the Jordan into the land that I am giving to the children of Israel. I have given you every place where the sole of your foot will tread, just as I promised to Moses." This divine mandate establishes Joshua's authority and reassures the people of God's continued presence and faithfulness.

Preparation of the People:
Joshua's preparation of the Israelites involves both spiritual and practical elements. He instructs the officers of the people to pass through the camp and command the people, "Prepare your provisions, for within three days you will cross the Jordan to go in and take possession of the land that the LORD your God is giving you to possess" (Joshua 1:11). This directive emphasizes readiness and obedience, as the people must trust in God's timing and provision.

Spiritual Readiness:
Joshua emphasizes the importance of spiritual readiness by reminding the people of the need to adhere to the Law given through Moses. In Joshua 1:7-8 , God instructs Joshua, "Be strong and very courageous. Be careful to observe all the law that My servant Moses commanded you. Do not turn from it to the right or to the left, so that you may prosper wherever you go. This Book of the Law must not depart from your mouth; you are to meditate on it day and night, so that you may be careful to do everything written in it. For then you will prosper and succeed in all you do." This underscores the necessity of faithfulness to God's commandments as a foundation for success.

Encouragement and Unity:
Joshua also seeks to unify and encourage the people. He reminds the Reubenites, Gadites, and the half-tribe of Manasseh of their commitment to assist their fellow Israelites in conquering the land, despite having already received their inheritance east of the Jordan (Joshua 1:12-15). This call to unity and mutual support is crucial for the collective success of the nation.

Crossing the Jordan:
The crossing of the Jordan River is a significant act of faith and a miraculous demonstration of God's power. In Joshua 3:5 , Joshua instructs the people, "Consecrate yourselves, for tomorrow the LORD will do wonders among you." The priests carrying the Ark of the Covenant lead the way, and as their feet touch the water, the river stops flowing, allowing the Israelites to cross on dry ground (Joshua 3:15-17). This event parallels the crossing of the Red Sea and serves as a powerful reminder of God's presence and might.

Renewal of the Covenant:
Upon entering the Promised Land, Joshua leads the people in renewing their covenant with God. This includes the circumcision of the new generation born in the wilderness and the celebration of the Passover at Gilgal (Joshua 5:2-10). These acts signify the people's commitment to God and their identity as His chosen people.

Conclusion:
The preparation of the Israelites under Joshua's leadership is a testament to the importance of faith, obedience, and unity in fulfilling God's promises. Through Joshua's guidance, the people are equipped both spiritually and practically to undertake the conquest of Canaan, relying on God's strength and faithfulness.