The Book of Faith (Kitab Al-Iman)
Muslim :: Book 1 : Hadith 160
Ubaidullah b. Abu Bakr said: I heard Anas b. Malik saying: The Messenger of Allah (may peace be upon him) talked about the major sins, or he was asked about the major sins. Upon this he observed: Associating anyone with Allah, killing of a person, disobedience to parents. He (the Holy Prophet further) said: Should I not inform you about the gravest of the major sins, and (in this connection) observed: False utterance or false testimony. Shu'ba said. It was most probably" false testimony".
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