Joshua 3:3

3:3 and commanded the people: “When you see the ark of the covenant of the Lord your God being carried by the Levitical priests, you must leave here and walk behind it.

Joshua 3:14-17

3:14 So when the people left their tents to cross the Jordan, the priests carrying the ark of the covenant went ahead of them. 3:15 When the ones carrying the ark reached the Jordan and the feet of the priests carrying the ark touched the surface of the water – (the Jordan is at flood stage all during harvest time) – 3:16 the water coming downstream toward them stopped flowing. It piled up far upstream at Adam (the city near Zarethan); there was no water at all flowing to the sea of the Arabah (the Salt Sea). The people crossed the river opposite Jericho. 3:17 The priests carrying the ark of the covenant of the Lord stood firmly on dry ground in the middle of the Jordan. All Israel crossed over on dry ground until the entire nation was on the other side.