Do not return evil for evil, vengeance is the Lord's
Matthew 5:38–42 (ASV 1901)
38Ye have heard that it was said, An eye for an eye, and a tooth for a tooth: 39but I say unto you, Resist not him that is evil: but whosoever smiteth thee on thy right cheek, turn to him the other also. 40And if any man would go to law with thee, and take away thy coat, let him have thy cloak also. 41And whosoever shall compel thee to go one mile, go with him two. 42Give to him that asketh thee, and from him that would borrow of thee turn not thou away.
Romans 12:17–21 (ASV 1901)
17Render to no man evil for evil. Take thought for things honorable in the sight of all men. 18If it be possible, as much as in you lieth, be at peace with all men. 19Avenge not yourselves, beloved, but give place unto the wrath of God: for it is written, Vengeance belongeth unto me; I will recompense, saith the Lord. 20But if thine enemy hunger, feed him; if he thirst, give him to drink: for in so doing thou shalt heap coals of fire upon his head. 21Be not overcome of evil, but overcome evil with good.
1 Peter 3:8–12 (ASV 1901)
8Finally, be ye all likeminded, compassionate, loving as brethren, tenderhearted, humbleminded: 9not rendering evil for evil, or reviling for reviling; but contrariwise blessing; for hereunto were ye called, that ye should inherit a blessing. 10For,
He that would love life,
And see good days,
Let him refrain his tongue from evil,
And his lips that they speak no guile: