Ezekiel 43:16-19

The altar hearth shall be square, twelve cubits long by twelve broad. The ledge also shall be square, fourteen cubits long by fourteen broad, with a rim around it half a cubit broad, and its base one cubit all around. The steps of the altar shall face east.” And he said to me, “Son of man, thus says the Lord GOD: These are the ordinances for the altar: On the day when it is erected for offering burnt offerings upon it and for throwing blood against it, you shall give to the Levitical priests of the family of Zadok, who draw near to me to minister to me, declares the Lord GOD, a bull from the herd for a sin offering.