Exodus 29:30,35
And that son that is priest in his stead shall put them on seven days, when he comes into the tabernacle of the congregation to minister in the holy place.
Nave's Topical Index—AKJV

Ezekiel 43:25,26
Seven days shall you 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.
Nave's Topical Index—AKJV