Musnad Ahmad 908:12

'Abd al-Rahman narrated to us, from Sufyan, and Ibn Ja'far said: Shu'bah narrated to us, from Abu Ishaq, from Sa'id ibn Wahb, from Khabbab, who said: "We complained to the Prophet, peace and blessings of Allah be upon him, about the intensity of the heat (of the sand), but he did not relieve our complaint," meaning during the prayer. And Ibn Ja'far said: "So he did not relieve us."