It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When the heat becomes intense, perform the prayer at a cooler time, for the severity of heat is from the steam of Hell." And he said: "Hell complained to its Lord, saying, 'O my Lord! Some parts of me have consumed others.' So Allah Almighty allowed it two breaths: one breath in the winter and one in the summer. The extreme heat and the extreme cold that you experience are due to this."
Hadith Referenceالسنن المأثورة / باب ما جاء في الصلاة على الراحلة / 119
Hadith Takhrijصحیح بخاری، مواقیت الصلاة، باب الابراد بالظهر في شدة الحر، رقم: 536، 537، صحیح مسلم، المساجد ومواضع الصلاة، باب استحباب الابراد بالظهر في شدة الحر، رقم: 615