Musannaf Ibn Abi Shayba 3:2837

'Isa ibn Yunus and Ibn Numayr narrated to us, from Isma'il ibn Abi Khalid, from Qays, who said: My father came while the Prophet, peace and blessings of Allah be upon him, was delivering a sermon. He stood before him in the sun, so he (the Prophet) ordered him, and he was moved to the shade.