مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3893
Musnad of Abdullah bin Mas'ood
It was narrated from `Abdullah (رضي الله عنه), from the Prophet (ﷺ), that He used to recite this verse: “then is there any one who will remember (or receive admonition) (fahal min muddakir)?” (al-Qaımar 54:17), with (the letter) dal.
Musnad Ahmad 3918Its isnad is saheeh, al-Bukhari (4869) and Muslim (823)]