`Umar came cursing the disbelievers (of Quraish) on the day of Al-Khandaq (the battle of Trench) and said, "I could not offer the `Asr prayer till the sun had set. Then we went to Buthan and he offered the (`Asr) prayer after sunset and then he offered the Maghrib prayer.
Reference: Sahih al-Bukhari 598 In-book : Book 9, Hadith 74 USC-MSA web (English) : Vol. 1, Book 10, Hadith 572 (deprecated)
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