Musnad Ahmad 106:3

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Isma‘il, from Qays ibn Abi Hazim, that his father came while the Messenger of Allah (may Allah bless him and grant him peace) was delivering a sermon, and he sat in the sun. He said: So he gestured to him—or he said: he ordered him—to move to the shade.