Exodus 30:9-11

Lexham English Bible

⁹You will not offer on it strange incense or a burnt offering or a grain offering, and you will not pour a libation on it. ¹⁰And Aaron will make atonement on its horns one time in the year from the blood of the sin offering of the atonement; one time in the year he will make atonement on it throughout your generations; it is a most holy thing for Yahweh.”