Narrated Abdullah ibn Mas'ud:

The Prophet ﷺ used to read the verse "Is there any that will receive admonition (muddakir)? " that is with doubling of consonant [(dal)(d)].

Abu Dawud said: The word muddakir may be pronounced as mim (m) with a short vowel u. (dal)(d) with a short vowel and kaf (k) with a short vowel i.

حَدَّثَنَا حَفْصُ بْنُ عُمَرَ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي إِسْحَاقَ، عَنِ الأَسْوَدِ، عَنْ عَبْدِ اللَّهِ، أَنَّ النَّبِيَّ ﷺ كَانَ يَقْرَؤُهَا { فَهَلْ مِنْ مُدَّكِرٍ } يَعْنِي مُثَقَّلاً . قَالَ أَبُو دَاوُدَ مَضْمُومَةَ الْمِيمِ مَفْتُوحَةَ الدَّالِ مَكْسُورَةَ الْكَافِ .