Exodus 25:14

25:14 and put the poles into the rings at the sides of the ark in order to carry the ark with them.

Exodus 37:27

37:27 He also made two gold rings for it under its border, on its two sides, on opposite sides, as places for poles to carry it with.

Exodus 38:7

38:7 He put the poles into the rings on the sides of the altar, with which to carry it. He made the altar hollow, out of boards.