Musnad Ahmad 26:368

'Affan narrated to us, Shu'bah narrated to us, he said: Abu Ishaq informed us, he said: I heard al-Aswad narrating from 'Abdullah, from the Prophet, peace and blessings of Allah be upon him, that he used to recite this word: {فهل من مدكر} [Al-Qamar: 15] with the [letter] dal.