Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1295
Khabbab reported: We came to the Messenger of Allah (may peace be upon him) and we complained to the Messenger of Allah (may peace be upon him) about (saying prayer) on the extremely heated ground (or sand), but he paid no heed to us. Zuhair said: I asked Abu Ishaq whether it was about the noon prayer. He said: Yes. I again said whether it concerned the (offering) of the noon (prayer) in earlier hours. He said: Yes. I said: Did it concern expediting it? He said: Yes.