The Prophet ﷺ said, "When the heat becomes intense, delay the prayer until it cools down, for the intensity of the heat is from the blast of Hell."
حدثنا عبد الرزاق أخبرنا سفيان عن الأعمش عن ذكوان
قال النبي ﷺ إذا اشتد الحر فأبردوا بالصلاة فإن شدة الحر من فيح جهنم
Its isnad is sahih, its narrators are leading authorities, and it has already been mentioned at 11004.