Mukhtasar Bukhari

Narrated Abu Huraira (may Allah be pleased with him) from the Prophet (peace and blessings of Allah be upon him) that he said: "When the heat becomes intense, perform the prayer when it cools down, because the severity of heat is from the raging of Hell. And Hell complained to its Lord and said: O my Lord! One part of me has consumed another part. So Allah allowed it two breaths, one in the winter and one in the summer. And that is the severe heat which you feel and the severe cold which you experience."