Sahih Muslim Book 45, Hadith 132
This hadith has been transmitted on the authority of Zuhri with a slight variation of wording.
This hadith has been narrated on the authority of Ibn Shihab with the same chain of transmitters but with a slight variation of wording.
Should I inform you that slandering, that is in fact a tale-carrying which creates dissension amongst people, (and) he (further) said: The person tells the truth until he is recorded as truthful, and lie tells a lie until lie is recorded as a liar.