(50) باب مَا يَتَعَلَّقُ بِالْقِرَاءَاتِ
Abu Ishaq reported:
I saw a man asking Aswad b. Yazid who taught the Qur'an in the mosque: How do you recite the verse (fahal min muddakir) whether (the word muddakir) Is with (d) or (dh)? He (Aswad) said: It was with (d). I heard Abdullah b. Mas'ud saying that he had heard the Messenger of Allah (ﷺ) reciting (muddakir) with (d).
Reference: Sahih Muslim 823 a
In-book reference: Book 6, Hadith 342
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1797