Proverbs 15:26
The thoughts of the wicked are very hateful to Jehovah, 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 pleasing in Your sight, O Jehovah, my Rock and my Redeemer.
Psalm 37:30-31
The mouth of the righteous speaks wisdom, and his tongue talks of judgment.
Psalm 45:1
To the Chief Musician. Concerning the Lilies, for the sons of Korah, a contemplation; A Song of Loves. My heart is overflowing with a good matter; I speak of my works to the King; my tongue is the pen of a ready writer.
Proverbs 6:16-19
These six Jehovah hates; yea, seven are hateful to his soul:
Proverbs 15:23
A man has joy by the answer of his mouth, and a word in due season, how good it is!
Proverbs 24:9
The thought of foolishness is sin; and the scorner is hateful to men.
Jeremiah 4:14
O Jerusalem, cleanse your heart from evil so that you may be saved. How long shall your vain thoughts lodge within you?
Matthew 12:34-37
Offspring 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 come evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies;