From Sahih Muslim (Hadith 1402):
Abu Huraira reported:The Messenger of Allah (ﷺ) said: When it is hot, make delay (in the noon prayer) till it cools down, for the intensity of beat is from the Exhalation of Hell; and he also mentioned that Hellfire complained to the Lord (about the congested atmosphere) and so it was permitted to take two exhalations during the whole year, one exhalation during the winter and one exhalation during the summer
Reference: Muslim 1402