The Prophet ﷺ said, "The intensity of the heat is from the blast of Hell, so cool down the prayer by delaying it."
حدثنا يحيى بن سعيد عن الأعمش قال سمعت أبا صالح
عن النبي ﷺ أنه قال شدة الحر من فيح جهنم فأبردوا بالصلاة
Its isnad is sahih, its narrators are leading authorities, and the hadith has already appeared at 11004.