Seven days shalt thou prepare every day a goat for a sin offering: they shall also prepare a young bullock, and a ram out of the flock, without blemish.
Exodus 29:35-37
35
"Thus you shall do to Aaron and to his sons, according to all that I have commanded you; you shall ordain them through seven days.
36
"Each 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.
37
"For 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.
Leviticus 8:33
"You shall not go outside the doorway of the tent of meeting for seven days, until the day that the period of your ordination is fulfilled; for he will ordain you through seven days.