Sunan an-Nasa'i 3100
It was narrated that Ibn Shihab said:
"Sahl bin Sa'd said: 'I saw Marwan sitting in the Masjid so I went and sat beside him, and he told us that Zaid bin Thabit had told him, that the Messenger of Allah (ﷺ) dictated to him the words: [Not equal are those of the believers who sit (at home) and those who strive hard and fight in the cause of Allah]. Then Ibn umm Maktum came to him while he was dictating it to me (Zaid) and said: 'O Messenger of Allah! If I were able to go for Jihad I would go out for Jihad.' But he was a blind man. Then Allah revealed to His Messenger (ﷺ) - while his thigh was agaisnt my thigh, and (it became so heavy that) I thought my thigh would break, then it was lifted from him, and Allah, the Mighty and Sublime, revealed: 'Except those who are disabled (by injury or are blind or lame).'" [1]

[1] An-Nisa' 4:95.
أَخْبَرَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ بْنِ سَعْدٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنِي سَهْلُ بْنُ سَعْدٍ، قَالَ رَأَيْتُ مَرْوَانَ جَالِسًا فِي الْمَسْجِدِ فَأَقْبَلْتُ حَتَّى جَلَسْتُ إِلَى جَنْبِهِ فَأَخْبَرَنَا أَنَّ زَيْدَ بْنَ ثَابِتٍ أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَمْلَى عَلَيْهِ لاَ يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ وَالْمُجَاهِدُونَ فِي سَبِيلِ اللَّهِ ‏.‏ قَالَ فَجَاءَهُ ابْنُ أُمِّ مَكْتُومٍ وَهُوَ يُمِلُّهَا عَلَىَّ فَقَالَ يَا رَسُولَ اللَّهِ لَوْ أَسْتَطِيعُ الْجِهَادَ لَجَاهَدْتُ ‏.‏ وَكَانَ رَجُلاً أَعْمَى فَأَنْزَلَ اللَّهُ عَلَى رَسُولِهِ صلى الله عليه وسلم وَفَخِذُهُ عَلَى فَخِذِي حَتَّى هَمَّتْ تَرُضُّ فَخِذِي ثُمَّ سُرِّيَ عَنْهُ فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ ‏{‏ غَيْرُ أُولِي الضَّرَرِ ‏}‏ ‏.‏