Ezekiel 43:16-19

And the altar hearth shall be twelve cubits long by twelve broad, square in the four sides thereof. And the ledge shall be fourteen cubits long by fourteen broad in the four sides thereof; and the border about it shall be half a cubit; and the bottom thereof shall be a cubit round about; and the steps thereof shall look toward the east. And he said unto me, Son of man, thus saith the Lord Jehovah: These are the ordinances of the altar in the day when they shall make it, to offer burnt-offerings thereon, and to sprinkle blood thereon. Thou shalt give to the priests the Levites that are of the seed of Zadok, who are near unto me, to minister unto me, saith the Lord Jehovah, a young bullock for a sin-offering.