Abu Hurairah reported the Messenger of Allah (ﷺ) as saying; when you come to pray while we are prostrating ourselves, you must prostrate yourselves, and do not reckon it anything (rak'ah) he has been present at the prayer.
Reference: Sunan Abi Dawud 893 In-book : Book 2, Hadith 503 English translation : Book 2, Hadith 892
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