Allah's Messenger (ﷺ) said, "If it is very hot, then pray the Zuhr prayer when it becomes (a bit) cooler, as the severity of the heat is from the raging of the Hell-fire."
Reference: Sahih al-Bukhari 533, 534 In-book : Book 9, Hadith 12 USC-MSA web (English) : Vol. 1, Book 10, Hadith 510 (deprecated)
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