Abu Ishaq narrates: I heard a man asking Aswad bin Yazid while he was teaching the Qur'an in the mosque. (The question was) How do you recite this verse? «‏‏‏‏فَهَلْ مِنْ مُدَّكِرٍ» ‏‏‏‏ Do you recite it with "dal" or with "dhal"? He replied: I recite it with "dal" because I heard Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) stating this. The Prophet Muhammad (peace be upon him) recited «فَهَلْ مِنْ مُدَّكِرٍ» that is, he recited it with "dal".