Êxodo 30:10

10 Once a year Aaron shall make atonement on its horns. This annual atonement must be made with the blood of the atoning sin offering Or [purification offering] for the generations to come. It is most holy to the Lord."

10 And Aaron shall make atonement upon the horns of it once in the year; with the blood of the sin-offering of atonement once in the year shall he make atonement for it throughout your generations: it is most holy unto Jehovah.