The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1868

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: He who performed ablution well, then came to Friday prayer, listened (to the sermon), kept silence all (his sins) between that time and the next Friday would be forgiven with three days extra, and he who touched pebbles caused an interruption.

Source materials are from the University of Southern California MSA site
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