Hadith 617
Abu Hurairah (RA) 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 heat is from the Exhalation of Hell; and he also mentioned that the Hellfire complained to the Lord (about the congested atmosphere) and so it was permitted to take two exhalation during the whole year, one exhalation during the winter and one exhalation during the summer.
Hadith 1159
'Abdullah bin 'Amr (RA) reported: The Messenger of Allah (ﷺ) said to me: Recite the whole of the Qur'an during every month. I said: I find power (to recite it) in a shorter period. He said: Then recite it in twenty nights. I said: I find power (to recite it in a shorter period even than this), whereupon he said: Then recite it in seven (nights) and do not exceed beyond it.