Exodus 25:12-15

25:12 You are to cast four gold rings for it and put them on its four feet, with two rings on one side and two rings on the other side. 25:13 You are to make poles of acacia wood, overlay them with gold, 25:14 and put the poles into the rings at the sides of the ark in order to carry the ark with them. 25:15 The poles must remain in the rings of the ark; they must not be removed from it.