For seven days

2 Chronicles 7:8-9
So at that time Solomon and all Israel with him—a very great assembly of people from Lebo-hamath to the Brook of Egypt—kept the feast for seven days. / On the eighth day they held a solemn assembly, for the dedication of the altar had lasted seven days, and the feast seven days more.

Leviticus 8:33-35
You must not go outside the entrance to the Tent of Meeting for seven days, until the days of your ordination are complete; for it will take seven days to ordain you. / What has been done today has been commanded by the LORD in order to make atonement on your behalf. / You must remain at the entrance to the Tent of Meeting day and night for seven days and keep the LORD’s charge so that you will not die, for this is what I have been commanded.”

1 Kings 8:65-66
So at that time Solomon and all Israel with him—a great assembly of people from Lebo-hamath to the Brook of Egypt—kept the feast before the LORD our God for seven days and seven more days—fourteen days in all. / On the fifteenth day Solomon sent the people away. So they blessed the king and went home, joyful and glad in heart for all the good things that the LORD had done for His servant David and for His people Israel.

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the priests are to make atonement for the altar

Exodus 29:36-37
Sacrifice a bull as a sin offering each day for atonement. Purify the altar by making atonement for it, and anoint it to consecrate it. / For seven days you shall make atonement for the altar and consecrate it. Then the altar will become most holy; whatever touches the altar will be holy.

Leviticus 8:15
Moses slaughtered the bull, took some of the blood, and applied it with his finger to all four horns of the altar, purifying the altar. He poured out the rest of the blood at the base of the altar and consecrated it so that atonement could be made on it.

Exodus 40:10-11
Anoint the altar of burnt offering and all its utensils; consecrate the altar, and it shall be most holy. / Anoint the basin and its stand and consecrate them.

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and cleanse it;

Leviticus 16:18-19
Then he shall go out to the altar that is before the LORD and make atonement for it. He is to take some of the bull’s blood and some of the goat’s blood and put it on all the horns of the altar. / He is to sprinkle some of the blood on it with his finger seven times to cleanse it and consecrate it from the uncleanness of the Israelites.

2 Chronicles 29:18-19
Then they went in to King Hezekiah and reported, “We have cleansed the entire house of the LORD, the altar of burnt offering with all its utensils, and the table of the showbread with all its utensils. / Moreover, we have prepared and consecrated all the articles that King Ahaz in his unfaithfulness cast aside during his reign. They are now in front of the altar of the LORD.”

Ezekiel 45:18-20
This is what the Lord GOD says: ‘On the first day of the first month you are to take a young bull without blemish and purify the sanctuary. / And the priest is to take some of the blood from the sin offering and put it on the doorposts of the temple, on the four corners of the ledge of the altar, and on the gateposts of the inner court. / You must do the same thing on the seventh day of the month for anyone who strays unintentionally or in ignorance. In this way you will make atonement for the temple.

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so they shall consecrate it.

Exodus 40:9-10
Take the anointing oil and anoint the tabernacle and everything in it; consecrate it along with all its furnishings, and it shall be holy. / Anoint the altar of burnt offering and all its utensils; consecrate the altar, and it shall be most holy.

Leviticus 8:10-12
Next, Moses took the anointing oil and anointed the tabernacle and everything in it; and so he consecrated them. / He sprinkled some of the oil on the altar seven times, anointing the altar and all its utensils, and the basin with its stand, to consecrate them. / He also poured some of the anointing oil on Aaron’s head and anointed him to consecrate him.

Numbers 7:10-11
When the altar was anointed, the leaders approached with their offerings for its dedication and presented them before the altar. / And the LORD said to Moses, “Each day one leader is to present his offering for the dedication of the altar.”

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Exodus 29:35-37
This is what you are to do for Aaron and his sons based on all that I have commanded you, taking seven days to ordain them. / Sacrifice a bull as a sin offering each day for atonement. Purify the altar by making atonement for it, and anoint it to consecrate it. / For seven days you shall make atonement for the altar and consecrate it. Then the altar will become most holy; whatever touches the altar will be holy.

Hebrews 10:10-14
And by that will, we have been sanctified through the sacrifice of the body of Jesus Christ once for all. / Day after day every priest stands to minister and to offer again and again the same sacrifices, which can never take away sins. / But when this Priest had offered for all time one sacrifice for sins, He sat down at the right hand of God. …

Leviticus 16:30
because on this day atonement will be made for you to cleanse you, and you will be clean from all your sins before the LORD.

Hebrews 9:13-14
For if the blood of goats and bulls and the ashes of a heifer sprinkled on those who are ceremonially unclean sanctify them so that their bodies are clean, / how much more will the blood of Christ, who through the eternal Spirit offered Himself unblemished to God, purify our consciences from works of death, so that we may serve the living God!