Ezekiel 43:12-14 Living Bible (TLB)
12 And this is the basic law of the Temple: Holiness! The entire top of the hill where the Temple is built is holy. Yes, this is the primary law concerning it.
13 “And these are the measurements of the altar: The base is 21 inches high, with a 9-inch rim around its edge, and it extends 21 inches beyond the altar on all sides. 14 The first stage of the altar is a stone platform 3½ feet high. This platform is 21 inches narrower than the base block on all sides. Rising from this is a narrower platform, 21 inches narrower on all sides, and 7 feet high.