On returning to Joshua, they reported, “There is no need to send all the people; two or three thousand men are enough to go up and attack Ai. Since the people of Ai are so few, you need not wear out all our people there.”
Jewish Publication Society of America Version (JPS1917) - Joshua 7:3 >And they returned to Joshua, and said unto him: 'Let not all the people go up; but let about two or three thousand men go up and smite Ai; make not all the people to toil thither; for they are but few.'