A man asked Al-Aswad, 'is it 'Fahal min-Muddakir' or'..Mudhdhakir?" Al Aswad replied, 'I have heard `Abdullah bin Masud reciting it, 'Fahal-min Muddakir'; I too, heard the Prophet (ﷺ) reciting it 'Fahal-min-Muddakir' with 'd'.
Sahih al-Bukhari Book 65, Hadith 392
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Sahih al-Bukhari Book 65, Hadith 391 Next Hadith → The Prophet (ﷺ) used to recite: "Fahal-min-Maddakir (then is there any that will receive admonition?")

Sahih al-Bukhari Book 65, Hadith 393