Yahya related to me from Malik from Abu'z Zinad from al-Araj from
Abu Hurayra that the Messenger of Allah, may Allah bless him and grant
him peace, said, "When the heat is fierce, wait until it gets cooler
before you do the prayer, for scorching heat is from the blast of
Jahannam."
Muwatta Malik Book 1, Hadith 29