Volume 7 · Book 70 · Hadith 557
Narrated Anas bin Malik: I heard Allah's Apostle saying, "Allah said, 'If I deprive my slave of his two beloved things (i.e., his eyes) and he remains patient, I will let him enter Paradise in compensation for them.'"
— Sahih Bukhari, Volume 7, Book 70: Patients, Hadith #557