Job 31:30
(Neither have I suffered my mouth to sin by asking his life with a curse;)
Romans 12:14
Bless them that persecute you; bless, and curse not.
Exodus 23:4-5
If thou meet thine enemy's ox or his ass going astray, thou shalt certainly bring it back to him.
Ecclesiastes 5:2
Be not rash with thy mouth, and let not thy heart be hasty to utter anything before God: for God is in the heavens, and thou upon earth; therefore let thy words be few.
Ecclesiastes 5:6
Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that it was an inadvertence. Wherefore should God be wroth at thy voice, and destroy the work of thy hands?
Matthew 5:22
But I say unto you, that every one that is lightly angry with his brother shall be subject to the judgment; but whosoever shall say to his brother, Raca, shall be subject to be called before the sanhedrim; but whosoever shall say, Fool, shall be subject to the penalty of the hell of fire.
Matthew 5:43-44
Ye have heard that it has been said, Thou shalt love thy neighbour and hate thine enemy.
Matthew 12:36
But I say unto you, that every idle word which men shall say, they shall render an account of it in judgment-day:
James 3:6
and the tongue is fire, the world of unrighteousness; the tongue is set in our members, the defiler of the whole body, and which sets fire to the course of nature, and is set on fire of hell.
James 3:9-10
Therewith bless we the Lord and Father, and therewith curse we men made after the likeness of God.
1 Peter 2:22-23
who did no sin, neither was guile found in his mouth;
1 Peter 3:9
not rendering evil for evil, or railing for railing; but on the contrary, blessing others, because ye have been called to this, that ye should inherit blessing.