2 Chronicles 29:21

Overview - 2 Chronicles 29
Hezekiah's good reign.
He restores religion.
He exhorts the Levites.
12 They sanctify themselves, and cleanse the house of God
20 Hezekiah offers solemn sacrifices, wherein the Levites are more forward than the priests.
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2 Chronicles 29:21  (King James Version)
And they brought seven bullocks, and seven rams, and seven lambs, and seven he goats, for a sin offering for the kingdom, and for the sanctuary, and for Judah. And he commanded the priests the sons of Aaron to offer them on the altar of the LORD.

they brought
The law only required one bullock for the sins of the high priest, another for the sins of the people, and one he-goat for the sins of the prince: but Hezekiah offered many more, and the reason appears sufficiently evident: the law only speaks of the sins of ignorance, but here there were sins of every dye, idolatry, apostasy from the Divine worship, profanation of the temple, etc
, etc. The sin offerings, we are informed, were offered, first, for the Kingdom, for the transgressions of the king and his family; secondly, for the sanctuary, which had been defiled and polluted; and for the priests, who had been profane, negligent, and unholy; and finally, for Judah, for the whole mass of the people, who had been led away into every kind of abomination by the above examples.

Numbers 23:1 Numbers 23:14 Numbers 23:29 ; 1 Chronicles 15:26 ; Ezra 8:35 ; Job 42:8 ; Ezekiel 45:23

a sin offering
Leviticus 4:3-14 ; Numbers 15:22-24 ; 2 Corinthians 5:21