Joshua 4:11-13

11and when all the people had finished crossing over, the ark of Adonai and the kohanim crossed over in the presence of the people.

12Also the children of Reuben, the children of Gad and the half-tribe of Manasseh crossed over armed ahead of Bnei-Yisrael, just as Moses had said to them—

13about 40,000 equipped for war crossed over before Adonai for battle to the plains of Jericho.