five thousand
Joshua 8:2
and you shall do to Ai and its king as you did to Jericho and its king; only its spoil and its cattle you shall take as booty for yourselves; lay an ambush against the city, behind it."
Joshua 8:3
So Joshua arose, and all the fighting men, to go up to Ai; and Joshua chose thirty thousand mighty men of valor, and sent them forth by night.