Yahya related to me from Malik from Abu'z Zinad from al-Araj fromAbu Hurayra that the Messenger of Allah, may Allah bless him and granthim peace, said, "When the heat is fierce, wait until it gets coolerbefore you do the prayer, for scorching heat is from the blast ofJahannam."
App reference: Book 1, Hadith 29
USC-MSA web (English) reference: Book 1, Hadith 29
Arabic reference: Book 1, Hadith 30