“And they brought the captives, and the prey, and the spoil, unto Moses, and Eleazar the priest, and unto the congregation of the children of Israel, unto the camp at the plains of Moab, which are by Jordan near Jericho.”
King James Version (KJV)
31:13 Without the camp - Partly to put respect upon them, and congratulate with them for their happy success; and partly to prevent the pollution of the camp by the untimely entrance of the warriors into it.