31 The mouth of the righteous produces wisdom, but the perverse tongue will be cut off.
Proverbs 10:31 Cross References - WEB
Psalms 31:18
18 Let the lying lips be mute, which speak against the righteous insolently, with pride and contempt.
Psalms 37:30
30 The mouth of the righteous talks of wisdom. His tongue speaks justice.
Psalms 63:11
11 But the king shall rejoice in God. Everyone who swears by him will praise him, for the mouth of those who speak lies shall be silenced.
Psalms 120:3-4
Proverbs 10:11
11 The mouth of the righteous is a spring of life, but violence covers the mouth of the wicked.
Proverbs 10:13
13 Wisdom is found on the lips of him who has discernment, but a rod is for the back of him who is void of understanding.