Proverbs 13 King James Version (KJV)
13 A wise son heareth his father's instruction: but a scorner heareth not rebuke.
2 A man shall eat good by the fruit of his mouth: but the soul of the transgressors shall eat violence.
3 He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction.

A man shall eat good by the fruit a of [his] mouth: but the soul of the transgressors [shall eat] violence.
If he uses his tongue to God's glory, and the profit of his neighbour, God will bless him.