Joshua 4:10-13

10For the priests that bare the ark stood in the midst of the Jordan, until everything was finished that Jehovah commanded Joshua to speak unto the people, according to all that Moses commanded Joshua: and the people hasted and passed over. 11And it came to pass, when all the people were clean passed over, that the ark of Jehovah passed over, and the priests, in the presence of the people. 12And the children of Reuben, and the children of Gad, and the half-tribe of Manasseh, passed over armed before the children of Israel, as Moses spake unto them: 13about forty thousand ready armed for war passed over before Jehovah unto battle, to the plains of Jericho.