Kommentar zu Divrej Hajamim II 8:12

on the altar of the Lord This was the copper altar that Solomon built. Some explain that this was the copper altar that Solomon made instead of the copper altar that Moses built, but this is astounding, because it is written (II Kings 16:15): “and the burnt offerings of the entire people of the land, etc. and the blood of every burnt offering, etc. shall be for me to visit,” i.e., the copper altar, which was there heretofore, shall be for me to visit. This proves that Moses’ copper altar was still there.