Musnad Ahmad 30:1463

Muhammad ibn Ja‘far narrated to us, Ibn Jurayj narrated to us, ‘Ata’ narrated to me that he heard Abu Hurayrah saying: "Delay the prayer [until the heat cools], for the intensity of the heat is from the boiling of Hell." "In every prayer there is recitation. So, whatever the Messenger of Allah (peace and blessings of Allah be upon him) made us hear, we have made you hear, and whatever he kept hidden from us, we have kept hidden from you."