It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him); he said: When this verse was revealed: "Not equal are those of the believers who sit (at home) and those who strive in the way of Allah" [al-Nisa: 95], Ibn Umm Maktum (may Allah be pleased with him) came and said: O Messenger of Allah! Is there no concession for me? He said: "No." Ibn Umm Maktum said: O Allah! I am blind, so grant me a concession. Then Allah revealed the words "except those who have a disability" [al-Nisa: 95], and the Messenger of Allah (peace and blessings be upon him) ordered that it be written down.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5034