(1) باب
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. (ES)
Reference (ES): Sunan Abi Dawud 3994 (ES)
In-book reference (ES): Book 32, Hadith 26 (ES)
English translation (ES): Book 31, Hadith 3983 (ES)