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.

Exodus 37:3-5

37:3 He cast four gold rings for it that he put on its four feet, with two rings on one side and two rings on the other side. 37:4 He made poles of acacia wood, overlaid them with gold, 37:5 and put the poles into the rings on the sides of the ark in order to carry the ark.

Numbers 4:6

4:6 Then they must put over it a covering of fine leather and spread over that a cloth entirely of blue, and then they must insert its poles.