The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fada'il)
Muslim :: Book 30 : Hadith 5818
Abu Huraira reported that he heard Allah's Messenger (may peace be upon him) as saying: Avoid that which I forbid you to do and do that which I command you to do to the best of your capacity. Verily the people before you went to their doom because they had put too many questions to their Prophets and then disagreed with their teachings.