Ezekiel 43:12-13

12This is the law of the temple: Its entire area all around on the top of the mountain (Mount Moriah) shall be most holy. Behold, this is the law of the temple.

13“And these are the measurements of the altar [of burnt offering] in cubits (the cubit being a [long] cubit [the length of a forearm] and a hand width): the base shall be a cubit [long] and a cubit wide, with its border on its edge all around it of a span [in width]. And this shall be the height of the base of the altar.