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 5752
'A'isha, the wife of Allah's Apostle (may peace be upon him), said that whenever he had to choose between two things he adopted the easier one, provided it was nor sin, but if it was any sin he was the one wio was the farthest from it of the people; and Allah's Messenger (may peace be upon him) never took revenge from anyone because of his personal grievance, unless what Allah, the Exalted and Glorious, had made inviolable had been violated.