Musannaf Ibn Abi Shayba 3:3939

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from al-Musayyab ibn Rafi', from Tamim ibn Tarafa, from Jabir ibn Samurah, he said: The Prophet, may Allah bless him and grant him peace, said: "People must certainly cease raising their eyes toward the sky during prayer, or else they will not return to them."