Таргум к Бамидбар 19:14

This is the indication of the law concerning a man when he hath died under the outspread tent every one who entereth into the tent by the way of the door, but not from its side, when its door is open, (or when one hath opened its door,) and whatever is in the tent, its floor, stone, wood, and vessels, shall be unclean seven days.