It is reported from Hudhaifa that news reached him (the Holy Prophet) that a certain man carried tales. Upon this Hudhaifa remarked: I heard Allah’s Messenger (may peace be upon him) saying:

The tale−bearer shall not enter Paradise.

Sahih Muslim, Book of Faith, Chapter 46: SERIOUS PROHIBITION OF TALE−CARRYING, Hadith No. 189
 
 
Some definitions of talebearer from dictionaries:

1) a person who maliciously gossips or reveals secrets. [OXFORD DICTIONARY]

2) someone who gossips in an indiscreet manner. [COLLINS DICTIONARY]

3) one that spreads gossip or rumours. [MERRIAM-WEBSTER]

4) One who spreads malicious stories or gossip. [THE FREE DICTIONARY]