Joshua 3:12-13

12Now therefore, take for yourselves twelve men from the tribes of Israel, one man from every tribe.

13And it shall come to pass, as soon as the soles of the feet of the priests who bear the ark of the Lord, the Lord of all the earth, shall rest in the waters of the Jordan, that the waters of the Jordan shall be cut off, the waters that come down from upstream, and they shall stand as a heap.”