Ezekiel 43:16-19

The top of the altar is square, measuring 21 feet by 21 feet. The upper ledge also forms a square, measuring 24-1/2 feet by 24-1/2 feet, with a 21-inch gutter and a 10-1/2-inch curb all around the edge. There are steps going up the east side of the altar.” Then he said to me, “Son of man, this is what the Sovereign LORD says: These will be the regulations for the burning of offerings and the sprinkling of blood when the altar is built. At that time, the Levitical priests of the family of Zadok, who minister before me, are to be given a young bull for a sin offering, says the Sovereign LORD.