Proverbs 15:26
The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
Psalm 19:14
Let the words of my mouth, and the meditation of my heart, be acceptable in your sight, O LORD, my strength, and my redeemer.
Psalm 37:30-31
The mouth of the righteous speaks wisdom, and his tongue talks of justice.
Psalm 45:1
[To the Chief Musician upon shoshannim, for the Sons of Korah, a maschil, a song of loves.] My heart is overflowing with a good matter: I speak of the things which I have made concerning the king: my tongue is the pen of a ready scribe.
Proverbs 6:16-19
These six things does the LORD hate: yea, seven are an abomination unto him:
Proverbs 15:23
A man has joy by the answer of his mouth: and a word spoken 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 your heart from wickedness, that you may be saved. How long shall your vain thoughts lodge within you?
Matthew 12:34-37
O generation of vipers, how can you, being evil, speak good things? for out of the abundance of the heart the mouth speaks.
Matthew 15:19
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: