It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that he said: I used to write down the revelation for the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said to me: "Write: 'Not equal are those of the believers who sit (at home) and those who strive in the way of Allah'" [Surah al-Nisa: 95]. Just then Sayyiduna Abdullah bin Umm Maktum (may Allah be pleased with him) came and said: O Messenger of Allah, I love striving in the way of Allah, but I have the disability that you see; my sight has gone. Zayd bin Thabit (may Allah be pleased with him) said: Then the thigh of the Messenger of Allah (peace and blessings be upon him) became so heavy upon my thigh that I feared it would be crushed. Then he (peace and blessings be upon him) said: "Not equal are those of the believers who sit (at home), other than those who are disabled, and those who strive in the way of Allah" [Surah al-Nisa: 95].
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4880