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