The Messenger of Allah (ﷺ) said: He who finds (gets) a rak'ah of the afternoon (prayer) before the setting of the sun, he in fact gets (the full prayer), and he who gets a rak'ah of the morning (prayer) before the rising of the sun he in fact gets (the full prayer).
Reference: Sahih Muslim 608 c In-book : Book 5, Hadith 211 USC-MSA web (English) : Book 4, Hadith 1266 (deprecated)
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