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You shall not kill (Exodus 20.13)

Cain attacked his brother Abel and killed him. Then the Lord asked Cain, "Where is your brother Abel?" He answered, "I do not know. Am I my brother's keeper?" The Lord then said: "What have you done! Listen: your brother's blood cries out to me from the soil!"… Cain said to the Lord: "My punishment is too great to bear. Since you have now banished me from the soil, and I must avoid your presence and become a restless wanderer on the earth, anyone may kill me at sight." "Not so!" the Lord said to him. "If anyone kills Cain, Cain shall be avenged sevenfold." (Genesis 4.8b-10,12b-15a)

"You have heard that it was said to the men of old, 'You shall not kill; and whoever kills shall be liable to judgment.' But I say to you that every one who is angry with his brother shall be liable to judgment; whoever insults his brother shall be liable to the council, and whoever says, 'You fool!' shall be liable to the hell of fire." (Matthew 5.21-22)

Know this, my beloved brethren. Let every man be quick to hear, slow to speak, slow to anger, for the anger of man does not work the righteousness of God. (James 1.19-20)

I have set before you life and death, the blessing and the curse. Choose life, then, that you and your descendants may live. (Deuteronomy 30.19)

The Lord is gracious and merciful, slow to anger and abounding in love. The Lord is good to all, compassionate to every creature. (Psalm 145.8-9)

It is good sense in a man to be slow to anger, and it is his glory to overlook an offense. (Proverbs 19.11)