[Machine] The Messenger of Allah ﷺ sent me to a man who had married his father's wife. He commanded me to kill him and take his wealth. This is the narration of Al-Rawd Al-Bariyy, and some of our companions have adopted it, believing that he married her thinking it was permissible, but then he apostatized, and therefore, it is obligatory to kill him and take his wealth. Al-Shafi'i (may Allah have mercy on him) said, and it was narrated that Muawiyah wrote to Ibn Abbas and Zaid ibn Thabit, asking them about the inheritance of an apostate. They replied that it should go to the state treasury. Al-Shafi'i meant that it is booty.  

بَعَثَنِي رَسُولُ اللهِ ﷺ إِلَى رَجُلٍ نَكَحَ امْرَأَةَ أَبِيهِ فَأَمَرَنِي أَنْ أَضْرِبَ عُنُقَهُ وَآخُذَ مَالَهُ لَفْظُ حَدِيثِ الرُّوذْبَارِيِّ وَقَدْ حَمَلَ هَذَا بَعْضُ أَصْحَابِنَا عَلَى أَنَّهُ نَكَحَهَا مُعْتَقِدًا لِإِبَاحَتِهِ فَصَارَ بِهِ مُرْتَدًّا وَجَبَ قَتْلُهُ وَأَخْذُ مَالِهِ قَالَ الشَّافِعِيُّ رَحِمَهُ اللهُ وَقَدْ رُوِيَ أَنَّ مُعَاوِيَةَ كَتَبَ إِلَى ابْنِ عَبَّاسٍ وَزَيْدِ بْنِ ثَابِتٍ يَسْأَلُهُمَا عَنْ مِيرَاثِ الْمُرْتَدِّ فَقَالَا لِبَيْتِ الْمَالِ قَالَ الشَّافِعِيُّ يَعْنِيَانِ أَنَّهُ فَيْءٌ