Abu Dharr reported,

The muadhdhin of the Messenger of Allah ﷺ called the adhan for the noon prayer, and the Prophet ﷺ said, "Wait until it cools down, wait until it cools down," or he said, "Wait, wait." He said, "The intensity of the heat is from the blast of Hellfire, so when the heat becomes severe, delay the prayer until it cools down."Abu Dharr said, "We waited until we could see the shadows of the mounds."

Azami 1786

Sahih

عن أبي ذر قال

أذن مؤذن رسول الله ﷺ بالظهر، فقال النبي ﷺ: أبرد أبرد أو قال: انتظر انتظر وقال: إن شدة الحر من فيح جهنم، فإذا اشتد الحر فأبردوا عن الصلاة. قال أبو ذر: حتى رأينا فى التلول.

الأعظمي 1786صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Prayer times
Section
Delaying prayer during intense heat
Numbering
Jami al-Kamil 1786 (2nd edition)
Azami 1786