Sahih Bukhari Volume 6, Book 60, Hadith Number 117.

Narrated By Al-Bara : When the Verse: “Not equal are those of the believers who sit (at home)” (4.95) was revealed, Allah Apostle called for Zaid who wrote it. In the meantime Ibn Um Maktum came and complained of his blindness, so Allah revealed: “Except those who are disabled (by injury or are blind or lame…” etc.) (4.95)