The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 6095
Ibn Abbas reported that the Muslims neither looked to Abu Sufyan (with respect) nor did they sit in his company. he (Abu Sufyan) said to Allah's Apostle (may peace be upon him): Allah's Apostle, confer upon me three things. He replied in the affirmative. He (further) said: I have with me the most handsome and the best (woman) Umm Habiba, daughter of Abu Sufyan; marry her, whereupon he said: Yes. And he again said: Accept Mu'awiya to serve as your scribe. He said: Yes. He again said: Make me the commander (of the Muslim army) so that I should fight against the unbelievers as I fought against the Muslims. He said: Yes. Abu Zumnail said: If he had not asked for these three things from Allah's Apostle (may peace be upon him), he would have never conferred them upon him, for it was (his habit) to accede to everybody's (earnest) request.