(50) باب مَا يَتَعَلَّقُ بِالْقِرَاءَاتِ
Ishaq is reported to have said on the authority of Aswad who quoted on the authority of 'Abdullah b. Mas'ud that the Messenger of Allah (ﷺ) used to recite these words as (fahal min muddakir).
Reference: Sahih Muslim 823 b
In-book reference: Book 6, Hadith 343
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1798