عَنْ مُعَاذِ بْنِ جَبَلٍ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ مَنْ أَعْتَقَ رَقَبَةً مُؤْمِنَةً فَهِيَ فِدَاؤُهُ مِنَ النَّارِ
It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him and his family) said: Whoever frees a believing slave, it will be his ransom from Hell.