Yahya related to me from Malik from Ibn Shihab from Qabisa ibn Dhu'ayb that a man asked Uthman ibn Affan whether one could have intercourse with two sisters who one owned. Uthman said, "One ayat makes them halal, and one ayat makes them haram. As for me, I wouldn't like to do it." The man left him and met one of the companions of the Messenger of Allah ﷺ and asked him about it, and he said, "Had I any authority and I found someone who had done it, I would punish him as an example." Ibn Shihab added, "I think that it was Ali ibn Abi Talib. "

قَالَ فَخَرَجَ مِنْ عِنْدِهِ فَلَقِيَ رَجُلاً مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ فَسَأَلَهُ عَنْ ذَلِكَ فَقَالَ لَوْ كَانَ لِي مِنَ الأَمْرِ شَىْءٌ ثُمَّ وَجَدْتُ أَحَدًا فَعَلَ ذَلِكَ لَجَعَلْتُهُ نَكَالاً قَالَ ابْنُ شِهَابٍ أُرَاهُ عَلِيَّ بْنَ أَبِي طَالِبٍ

[AI] Uthman made something permissible for them through a verse, and prohibited it through another verse. As for me, I do not like to do this. He then left from there and met a man from the companions of the Prophet ﷺ . He said, "If I had any authority, and I found someone doing that, I would make him face consequences." Malik said, may Allah have mercy on him, that Ibn Shihab said, "I think he was referring to Ali ibn Abi Talib." Malik said, "And it reached me from Az-Zubayr ibn Al-Awwam the same thing."

عُثْمَانُ ؓ أَحَلَّتْهُمَا آيَةٌ وَحَرَّمَتْهُمَا آيَةٌ وَأَمَّا أَنَا فَلَا أُحِبُّ أَنْ أَصْنَعَ هَذَا قَالَ فَخَرَجَ مِنْ عِنْدِهِ فَلَقِيَ رَجُلًا مِنْ أَصْحَابِ النَّبِيِّ ﷺ فَقَالَ لَوْ كَانَ لِي مِنَ الْأَمْرِ شَيْءٌ ثُمَّ وَجَدْتُ أَحَدًا فَعَلَ ذَلِكَ لَجَعَلْتُهُ نَكَالًا قَالَ مَالِكٌ رَحِمَهُ اللهُ قَالَ ابْنُ شِهَابٍ أَرَاهُ عَلِيَّ بْنَ أَبِي طَالِبٍ ؓ قَالَ مَالِكٌ وَبَلَغَنِي عَنِ الزُّبَيْرِ بْنِ الْعَوَّامِ مِثْلُ ذَلِكَ