Jarir reported God’s Messenger as saying, “When a slave runs away his prayer is not accepted.” In a version on his authority he said, “If any slave runs away protection does not apply to him.” In another version on his authority he said, “If any slave runs away from his masters he has become an infidel till he returns to them.”
Abu Huraira reported God's Messenger as saying, “How excellent it is for a slave to be taken in death by God when worshipping his Lord well and obeying his master! How excellent it is for him!”
Abu Huraira told that he heard Abul Qasim (i.e. the Prophet) say, “If any one reviles his slave when he is innocent of what he said, he will be beaten on the day of resurrection, unless it is as he said.”