When he came, he said to him: “Write for me (Those of the believers who sit still are not on an equality)” I think he said: (with those who strive in the way of Allah). Ibn Umm Maktum said: “O Messenger of Allah, but I have hurt in my eyes, and before he left it was revealed (other than those who have a (disabling) hurt)”. This was narrated by Bukhari> Muhammad ibn Yusuf> Isra'il> Abu Ishaq.
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou