Joshua 3:9-13

And Joshua said unto the children of Israel, Come hither, and hear the words of the LORD your God. And Joshua said, Hereby ye shall know that the living God is among you, and that he will without fail drive out from before you the Canaanites, and the Hittites, and the Hivites, and the Perizzites, and the Girgashites, and the Amorites, and the Jebusites. Behold, the ark of the covenant of the Lord of all the earth passeth over before you into Jordan. Now therefore take you twelve men out of the tribes of Israel, out of every tribe a man. And it shall come to pass, as soon as the soles of the feet of the priests that bear the ark of the LORD, the Lord of all the earth, shall rest in the waters of Jordan, that the waters of Jordan shall be cut off from the waters that come down from above; and they shall stand upon an heap.