Ezekiel 43:16-19

Now the altar hearth shall be twelve cubits long by twelve wide, square in its four sides. The ledge shall be fourteen cubits long by fourteen wide on its four sides, and the border around it shall be half a cubit; and its base shall be a cubit all around, and its steps shall face the east.” [Ex 20:26] And He [the LORD] said to me, “Son of man, thus says the Lord GOD, ‘These are the statutes and regulations for [the use of] the altar on the day that it is built, to offer burnt offerings on it and to sprinkle blood on it. You shall give to the priests, the Levites who are from the descendants of Zadok, who are close to Me to minister to Me,’ says the Lord GOD, ‘a young bull for a sin offering [as a memorial to Christ’s sacrifice].