Musnad Ahmad 30:479

'Abd al-Razzaq narrated to us, Sufyan narrated to us, from al-A'mash, from Dhakwan, from Abu Hurayrah, who attributed it to the Prophet (peace and blessings of Allah be upon him), who said: "Allah says: 'Whoever I take away his two beloved ones (his eyes), and he remains patient and seeks reward, I will not be satisfied with any reward for him less than Paradise.'"