It is narrated marfu‘an from Hazrat Abu Hurairah (may Allah be pleased with him) that Allah Almighty says: If I take away the light of both beloved eyes of a person and he remains patient over it and hopes for reward, then I am not pleased with any reward for him except Paradise.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7597