عن أبي هريرة رضي الله عنه مرفوعاً: «من أعتق رقبة مسلمة أعتق الله بكل عضو منه، عضوًا منه في النار، حتى فرجه بفرجه».  
                        
[صحيح] - [متفق عليه]
                        
 المزيــد ... 
                    
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "He who sets free a Muslim slave, Allah will deliver from the fire of Hell every part of his body in return for every part of the slave's body, even his private parts." 
                                                     
                                                                                                    
[Authentic hadith] - [Narrated by Bukhari & Muslim]                                            
This Hadīth states the virtue of manumitting Muslim slaves; whoever frees a slave, it is as if he has freed his own entire body from the Hellfire. Freeing Muslim slaves empowers Muslims by ridding them of the humiliation of slavery.