Deuteronomy 19:4-6
Now this is the situation regarding the manslayer who flees to one of these cities to save his life, having killed his neighbor accidentally, without intending to harm him: / If he goes into the forest with his neighbor to cut timber and swings his axe to chop down a tree, but the blade flies off the handle and strikes and kills his neighbor, he may flee to one of these cities to save his life. / Otherwise, the avenger of blood might pursue the manslayer in a rage, overtake him if the distance is great, and strike him dead though he did not deserve to die, since he did not intend any harm.

Joshua 20:3-5
so that anyone who kills another unintentionally or accidentally may flee there. These will be your refuge from the avenger of blood. / When someone flees to one of these cities, stands at the entrance of the city gate, and states his case before its elders, they are to bring him into the city and give him a place to live among them. / Now if the avenger of blood pursues him, they must not surrender the manslayer into his hand, because that man killed his neighbor accidentally without prior malice.

Exodus 21:13
If, however, he did not lie in wait, but God allowed it to happen, then I will appoint for you a place where he may flee.

1 Kings 2:28-34
When the news reached Joab, who had conspired with Adonijah but not with Absalom, he fled to the tent of the LORD and took hold of the horns of the altar. / It was reported to King Solomon: “Joab has fled to the tent of the LORD and is now beside the altar.” So Solomon sent Benaiah son of Jehoiada, saying, “Go, strike him down!” / And Benaiah entered the tent of the LORD and said to Joab, “The king says, ‘Come out!’” But Joab replied, “No, I will die here.” So Benaiah relayed the message to the king, saying, “This is how Joab answered me.” ...

2 Samuel 14:5-7
“What troubles you?” the king asked her. “Indeed,” she said, “I am a widow, for my husband is dead. / And your maidservant had two sons who were fighting in the field with no one to separate them, and one struck the other and killed him. / Now the whole clan has risen up against your maidservant and said, ‘Hand over the one who struck down his brother, that we may put him to death for the life of the brother whom he killed. Then we will cut off the heir as well!’ So they would extinguish my one remaining ember by not preserving my husband’s name or posterity on the earth.”

Leviticus 4:2
“Tell the Israelites to do as follows with one who sins unintentionally against any of the LORD’s commandments and does what is forbidden by them:

Leviticus 5:15
“If someone acts unfaithfully and sins unintentionally against any of the LORD’s holy things, he must bring his guilt offering to the LORD: an unblemished ram from the flock, of proper value in silver shekels according to the sanctuary shekel; it is a guilt offering.

Acts 3:17
And now, brothers, I know that you acted in ignorance, as did your leaders.

Acts 17:30
Although God overlooked the ignorance of earlier times, He now commands all people everywhere to repent.

Luke 23:34
Then Jesus said, “Father, forgive them, for they do not know what they are doing.” And they divided up His garments by casting lots.

1 Timothy 1:13
I was formerly a blasphemer, a persecutor, and a violent man; yet because I had acted in ignorance and unbelief, I was shown mercy.

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.

Romans 7:15-20
I do not understand what I do. For what I want to do, I do not do. But what I hate, I do. / And if I do what I do not want to do, I admit that the law is good. / In that case, it is no longer I who do it, but it is sin living in me that does it. ...

1 John 3:15
Everyone who hates his brother is a murderer, and you know that eternal life does not reside in a murderer.

Matthew 5:21-22
You have heard that it was said to the ancients, ‘Do not murder’ and ‘Anyone who murders will be subject to judgment.’ / But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, ‘Raca,’ will be subject to the Sanhedrin. But anyone who says, ‘You fool!’ will be subject to the fire of hell.