Leviticus 8:33
And see that ye depart not from the door of the tabernacle of witness, seven days long: until the days of your full offerings be at an end. For seven days must your hands be filled,
Exodus 29:35
And see thou do unto Aaron and his sons, even so in all things as I have commanded thee: that thou fill their hands seven days
Exodus 29:30
And that son that is priest in his stead after him, shall put them on seven days: that he go into the tabernacle of witness, to minister in the holy place.
Leviticus 14:8
"And he that is cleansed shall wash his clothes and shave off all his hair, and wash himself in water, and then he is clean. And after that he shall come into the host, but shall tarry without his tent seven days.
Numbers 19:12
And he shall purify himself with the ashes the third day and then he shall be clean the seventh day. And if he purify not himself the third day, then the seventh day, he shall not be clean.
Ezekiel 43:25-27
Seven days shalt thou bring, every day a goat buck. A young bullock, and a ram of the flock, both without blemish, shall they offer.