Sayyiduna Malik bin Amr al-Qushayri (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "Whoever frees a Muslim neck (that is, a slave), it will become his ransom from Hell; each of its bones will count as freed (from Hell) in place of each of his bones."
Ahmad recorded it, and it is a longer narration than this; it is also in the chapter on righteousness and maintaining family ties. Its chain contains a narrator, Ali bin Zayd, in whom there is weakness, and he is hasan al-hadith (good in hadith).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العتق / 7256
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (299/19) اخرجه احمد فى المسند (344/4)»