Psalms 10:7 His mouth is full of cursing and deceit and fraud: under his tongue [is] mischief and vanity.

Psalms 50:19 Thou givest thy mouth to evil, and thy tongue frameth deceit.

Proverbs 8:13 The fear of Jehovah is to hate evil: Pride, and arrogancy, and the evil way, And the perverse mouth, do I hate.

Isaiah 6:5  Then said I, Woe [is] me! for I am undone; because I [am] a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts.

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

Romans 3:14 Whose mouth [is] full of cursing and bitterness:

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 nor filthiness, nor foolish talking, or jesting, which are not befitting: 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.

James 1:26 If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion [is] vain.

James 3:8 But the tongue can no man tame; [it is] an unruly evil, full of deadly poison. Jas 3:9 Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God. Jas 3:10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.