Cursing

Exodus 20:7 - Thou shalt not take the name of the LORD thy God in vain; for the LORD will not hold him guiltless that taketh his name in vain.
Psalms 109:17 - As he loved cursing, so let it come unto him: as he delighted not in blessing, so let it be far from him.
Proverbs 18:21 - Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
Matthew 15:10 - And he called the multitude, and said unto them, Hear, and understand:

Matthew 15:11 - Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.

Matthew 15:18 - But those things which proceed out of the mouth come forth from the heart; and they defile the man.

Matthew 15:19 - For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:

Matthew 15:20 - These are the things which defile a man: but to eat with unwashen hands defileth not a man.
Luke 6:28 - Bless them that curse you, and pray for them which despitefully use you.
Romans 12:14 - Bless them which persecute you: bless, and curse not.
Ephesians 4:29 - Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Ephesians 5:4 - Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.
Colossians 3:8 - But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
Colossians 4:6 - Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every man.