Abu Hurairah reported the Messenger of Allah (ﷺ) as saying:
If anyone says a rak'ah of the 'Asr prayer before sunset, he has observed (the 'Asr prayer), and if anyone performs a rak'ah of the Fajr prayer, he has observed (the Fajr prayer).
Reference: Sunan Abi Dawud 412 In-book : Book 2, Hadith 22 English translation : Book 2, Hadith 412
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