Ezekiel 43:16-19

The altar hearth is square, twelve cubits long and twelve cubits wide. The upper ledge also is square, fourteen cubits long and fourteen cubits wide. All around the altar is a gutter of one cubit with a rim of half a cubit. The steps of the altar face east.” Then he said to me, “Son of man, this is what the Sovereign LORD says: These will be the regulations for sacrificing burnt offerings and splashing blood against the altar when it is built: You are to give a young bull as a sin offering to the Levitical priests of the family of Zadok, who come near to minister before me, declares the Sovereign LORD.