Proverbs 11:9 An hypocrite with his mouth destroyeth his neighbour: but through knowledge shall the just be delivered.(KJV)
Jeremiah 6:28 They are all grievous revolters, walking with slanders: they are brass and iron; they are all corrupters.(KJV)
Gossip destroys reputations, friendships, etc.
Commandments Against It
Leviticus 19:16 Thou shalt not go up and down as a talebearer among thy people: neither shalt thou stand against the blood of thy neighbor: I am the LORD.(KJV)
That verse is a direct commandment not to spread gossip! Other commandments apply as well, for instance: Luke 3:14 "…Do violence to no man, neither accuse any falsely; and be content with your wages." Most gossip tends to be lies. If you spread them you yourself are accusing falsely. Proverbs 24:28 Be not a witness against thy neighbor without cause; and deceive not with thy lips.(KJV) Psalm 50:20 Thou sittest and speakest against thy brother; thou slanderest thine own mother's son.(KJV)