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Bulugh al-Maramوَعَنْ مُعَاذِ بْنِ جَبَلٍ - رضى الله عنه - -فِي رَجُلٍ أَسْلَمَ ثُمَّ تَهَوَّدَ-: { لَا أَجْلِسُ حَتَّى يُقْتَلَ, قَضَاءُ اَللَّهِ وَرَسُولِهِ, فَأُمِرَ بِهِ, فَقُتِلَ. مُتَّفَقٌ عَلَيْهِ } . 1 . وَفِي رِوَايَةٍ لِأَبِي دَاوُدَ: { وَكَانَ قَدْ اُسْتُتِيبَ قَبْلَ ذَلِكَ } . 2 .
Mu'adh bin Jabal (RAA) narrated - concerning a man who embraced Islam and then turned to Judaism (i.e. apostated), "I shall not sit down until he is killed. That is the Command of Allah and His Messenger, and he gave an order that he must be killed and so he was.' Agreed upon. In a version by Abu Dawud, "He was given a chance to repent and return to Islam but he refused.'
Reference: English : Book 9, Hadith 1241
Arabic : Book 9, Hadith 1213
Arabic : Book 9, Hadith 1213