Exodus 29:31-37
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31“Now you shall take the ram of ordination and boil its flesh in a holy place. 32Then Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket, at the doorway of the tent of meeting. 33So they shall eat those things by which atonement was made at their ordination and consecration; but a layman shall not eat them, because they are holy. 34And if any of the flesh of ordination or any of the bread remains until morning, then you shall burn the remainder with fire; it shall not be eaten, because it is holy.
35“So you shall do for Aaron and for his sons, according to all that I have commanded you; you shall ordain them for seven days. 36Each day you shall offer a bull as a sin offering for atonement, and you shall purify the altar when you make atonement for it, and you shall anoint it to consecrate it. 37For seven days you shall make atonement for the altar and consecrate it; then the altar shall be most holy, and whatever touches the altar shall be holy.