Proverbs 15:26
Evil devices are an abomination to Jehovah; But pleasant words are pure.
Psalm 19:14
Let the words of my mouth and the meditation of my heart Be acceptable in thy sight, O Jehovah, my rock, and my redeemer.
Psalm 37:30-31
The mouth of the righteous talketh of wisdom, And his tongue speaketh justice.
Psalm 45:1
My heart overfloweth with a goodly matter; I speak the things which I have made touching the king: My tongue is the pen of a ready writer.
Proverbs 6:16-19
There are six things which Jehovah hateth; Yea, seven which are an abomination unto him:
Proverbs 15:23
A man hath joy in the answer of his mouth; And a word in due season, how good is it!
Proverbs 24:9
The thought of foolishness is sin; And the scoffer is an abomination to men.
Jeremiah 4:14
O Jerusalem, wash thy heart from wickedness, that thou mayest be saved. How long shall thine evil thoughts lodge within thee?
Matthew 12:34-37
Ye offspring of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Matthew 15:19
For out of the heart come forth evil thoughts, murders, adulteries, fornications, thefts, false witness, railings: