Musannaf Ibn Abi Shayba 3:2876

Yazid ibn Harun narrated to us, he said: Muhammad ibn Ishaq informed us, from Nafi’, from Ibn Umar, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "If one of you becomes drowsy on the day of Friday, let him move from his sitting place to another."