Exodus 27:6-8

Amplified Bible

⁶ You shall make [carrying] poles for the altar, poles of acacia wood, overlaid with bronze. ⁷ The poles shall be inserted through the rings on the two sides of the altar so that it may be carried.^{(A) 8} You are to make the altar hollow with planks; as you were shown on the mountain [of Sinai], so shall it be made.