Musnad Ahmad 32:693

'Abd al-Razzaq narrated to us, Sufyan informed us, from Jabir, from Khaythama, from Anas, who said: The Prophet, peace and blessings of Allah be upon him, entered upon Zayd ibn Arqam to visit him while he was complaining of his eyes. He said: "How would you be if your eye were as it is?" He said: "I would be patient and seek the reward [from Allah]." He said: "If your eye were as it is, you would meet Allah without any sin."