Proverbs 15:26
The thoughts of the evil man are an abomination to Jehovah; but pure words are pleasant.
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 proffereth wisdom, and his tongue speaketh judgment;
Psalm 45:1
{To the chief Musician. Upon Shoshannim. Of the sons of Korah. An instruction; a song of the Beloved.} My heart is welling forth with a good matter: I say what I have composed touching the king. My tongue is the pen of a ready writer.
Proverbs 6:16-19
These six things doth Jehovah hate, yea, seven are an abomination unto him:
Proverbs 15:23
A man hath joy by the answer of his mouth; and a word in its season, how good is it!
Proverbs 24:9
The purpose of folly is sin, and the scorner is an abomination to men.
Jeremiah 4:14
Wash thy heart, Jerusalem, from wickedness, that thou mayest be saved. How long shall thy vain thoughts lodge within thee?
Matthew 12:34-37
Offspring of vipers! how can ye speak good things, being wicked? For of the abundance of the heart the mouth speaks.
Matthew 15:19
For out of the heart come forth evil thoughts, murders, adulteries, fornications, thefts, false witnessings, blasphemies;