The Messenger of Allah (ﷺ) said: He who finds a prostration before sunset or at dawn (prayer) before the rising (of the sun) he in fact finds that (prayer), and prostration implies a rak'ah.
Reference: Sahih Muslim 609 In-book : Book 5, Hadith 208 USC-MSA web (English) : Book 4, Hadith 1264 (deprecated)
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