Proverbs 15:26
Plans of evil [are] an abomination of Yahweh, but gracious words are pure.
Psalm 19:14
Let the words of my mouth and the meditation of my heart be acceptable in your presence, O Yahweh, my rock and my redeemer.
Psalm 37:30-31
[The] mouth of [the] righteous utters wisdom, and his tongue speaks justice.
Psalm 45:1
My heart is moved [with] a good word; I recite my {compositions} to [the] king. My tongue [is the] pen [of] a skilled scribe.
Proverbs 6:16-19
There are six [things] Yahweh hates, and seven [things are] abominations of his soul:
Proverbs 15:23
Joy [belongs] to a man with answers in his mouth, and a word in its time, how good [it is]!
Proverbs 24:9
Devising folly [is] a sin, and an abomination to humankind [is] a scoffer.
Jeremiah 4:14
Cleanse your heart from wickedness, Jerusalem, so that you may be saved. {How long} will your thoughts of mischief dwell in your inner part?
Matthew 12:34-37
Offspring of vipers! How are you able to say good things [when you] are evil? For from the abundance of the heart the mouth speaks.
Matthew 15:19
For from the heart come evil plans, murder, adultery, sexual immorality, theft, false witness, abusive speech.