Proverbs 10:31
"The mouth of the just bringeth forth wisdom: but the froward tongue shall be cut out."
Cross References (ranked by relevance)
The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.
In the lips of him that hath understanding wisdom is found: but a rod is for the back of him that is void of understanding.
The mouth of a righteous man is a well of life: but violence covereth the mouth of the wicked.
But the king shall rejoice in God; every one that sweareth by him shall glory: but the mouth of them that speak lies shall be stopped.
Let the lying lips be put to silence; which speak grievous things proudly and contemptuously against the righteous.