Exodus 25:14-15

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 37:4-5

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.

Exodus 40:20

40:20 He took the testimony and put it in the ark, attached the poles to the ark, and then put the atonement lid on the ark.