Sahih al-Bukhari 4871
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · "... As if they were uprooted stems of date-palms. Then, how (terrible) was My Torment and My Warnings?" (V.54: 20, 21)
Narrated Abu 'Is-haq:
حَدَّثَنَا أَبُو نُعَيْمٍ ، حَدَّثَنَا زُهَيْرٌ ، عَنْ أَبِي إِسْحَاقَ ، أَنَّهُ سَمِعَ رَجُلاً، سَأَلَ الأَسْوَدَ فَهَلْ مِنْ مُدَّكِرٍ أَوْ مُذَّكِرٍ فَقَالَ سَمِعْتُ عَبْدَ اللَّهِ يَقْرَؤُهَا {فَهَلْ مِنْ مُدَّكِرٍ} قَالَ وَسَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقْرَؤُهَا {فَهَلْ مِنْ مُدَّكِرٍ} دَالاً.
A man asked Al-Aswad, 'is it 'Fahal min-Muddakir' or'..Mudhdhakir?" Al Aswad replied, 'I have heard `Abdullah bin Masud reciting it, 'Fahal-min Muddakir'; I too, heard the Prophet (ﷺ) reciting it 'Fahal-min-Muddakir' with 'd'.