Musnad Ahmad 907:32

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Sulayman, from al-Musayyab ibn Rafi‘, from Tamim ibn Tarafah, from Jabir ibn Samurah, from the Prophet (peace and blessings of Allah be upon him) that he said: "Does one of you not fear, when he raises his head while he is in prayer, that his sight will not return to him?"