Numbers 15:27-29
Also, if one person sins unintentionally, he is to present a year-old female goat as a sin offering. / And the priest shall make atonement before the LORD on behalf of the person who erred by sinning unintentionally; and when atonement has been made for him, he will be forgiven. / You shall have the same law for the one who acts in error, whether he is a native-born Israelite or a foreigner residing among you.

Leviticus 5:17-19
If someone sins and violates any of the LORD’s commandments even though he was unaware, he is guilty and shall bear his punishment. / He is to bring to the priest an unblemished ram of proper value from the flock as a guilt offering. Then the priest will make atonement on his behalf for the wrong he has committed in ignorance, and he will be forgiven. / It is a guilt offering; he was certainly guilty before the LORD.”

Leviticus 6:24-30
And the LORD said to Moses, / “Tell Aaron and his sons that this is the law of the sin offering: In the place where the burnt offering is slaughtered, the sin offering shall be slaughtered before the LORD; it is most holy. / The priest who offers it shall eat it; it must be eaten in a holy place, in the courtyard of the Tent of Meeting. ...

Numbers 28:15
In addition to the regular burnt offering with its drink offering, one male goat is to be presented to the LORD as a sin offering.

2 Chronicles 33:9-13
So Manasseh led the people of Judah and Jerusalem astray, so that they did greater evil than the nations that the LORD had destroyed before the Israelites. / And the LORD spoke to Manasseh and his people, but they did not listen. / So the LORD brought against them the military commanders of the king of Assyria, who captured Manasseh, put a hook in his nose, bound him with bronze shackles, and took him to Babylon. ...

2 Chronicles 29:21-24
They brought seven bulls, seven rams, seven lambs, and seven male goats as a sin offering for the kingdom, for the sanctuary, and for Judah. And the king commanded the priests, the descendants of Aaron, to offer them on the altar of the LORD. / So they slaughtered the bulls, and the priests took the blood and splattered it on the altar. They slaughtered the rams and splattered the blood on the altar. And they slaughtered the lambs and splattered the blood on the altar. / Then they brought the goats for the sin offering before the king and the assembly, who laid their hands on them. ...

1 Kings 8:33-34
When Your people Israel are defeated before an enemy because they have sinned against You, and they return to You and confess Your name, praying and pleading with You in this temple, / then may You hear from heaven and forgive the sin of Your people Israel. May You restore them to the land You gave to their fathers.

1 Kings 8:46-50
When they sin against You—for there is no one who does not sin—and You become angry with them and deliver them to an enemy who takes them as captives to his own land, whether far or near, / and when they come to their senses in the land to which they were taken, and they repent and plead with You in the land of their captors, saying, ‘We have sinned and done wrong; we have acted wickedly,’ / and when they return to You with all their heart and soul in the land of the enemies who took them captive, and when they pray to You in the direction of the land that You gave to their fathers, the city You have chosen, and the house I have built for Your Name, ...

2 Samuel 24:10-25
After David had numbered the troops, his conscience was stricken and he said to the LORD, “I have sinned greatly in what I have done. Now, O LORD, I beg You to take away the iniquity of Your servant, for I have acted very foolishly.” / When David got up in the morning, the word of the LORD had come to Gad the prophet, David’s seer: / “Go and tell David that this is what the LORD says: ‘I am offering you three options. Choose one of them, and I will carry it out against you.’” ...

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.

Hebrews 9:7
But only the high priest entered the second room, and then only once a year, and never without blood, which he offered for himself and for the sins the people had committed in ignorance.

Hebrews 9:22
According to the law, in fact, nearly everything must be purified with blood, and without the shedding of blood there is no forgiveness.

Hebrews 10:1-4
For the law is only a shadow of the good things to come, not the realities themselves. It can never, by the same sacrifices offered year after year, make perfect those who draw near to worship. / If it could, would not the offerings have ceased? For the worshipers would have been cleansed once for all, and would no longer have felt the guilt of their sins. / Instead, those sacrifices are an annual reminder of sins, ...

Hebrews 10:11-12
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.

Romans 3:23-25
for all have sinned and fall short of the glory of God, / and are justified freely by His grace through the redemption that is in Christ Jesus. / God presented Him as an atoning sacrifice in His blood through faith, in order to demonstrate His righteousness, because in His forbearance He had passed over the sins committed beforehand.