The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wa'l-Adab)
Muslim :: Book 32 : Hadith 6325
This hadith has been transmitted on the authority of Abu Huraira and in the hadith transmitted on the authority of Ibn Hatim Allah's Apostle (may peace be upon him) is reported to have said: When any one of you fights with his brother, he should avoid his face for Allah created Adam in His own image.