"I saw Marwan bin Al-Hakam sitting in the Masjid, so I went over to him until I sat next to him. He informed us that Zaid bin Thabit informed him, that the Prophet ﷺ dictated: 'Not equal among the believers are those who sit and the Mujahidin in the cause of Allah.' He said: 'So Ibn Umm Maktum came and he was dictating to me that he said: "O Messenger of Allah! By Allah! If I were capable of Jihad then I would participate in Jihad.' And he was a blind a man. So Allah revealed to His Messenger ﷺ - while his thigh was against my thigh - and it became so heavy that I was worried it was about to fracture my thigh. Then he was relieved of it, so Allah had revealed to him: Except those who are disabled."
أَخْبَرَهُ أَنَّ النَّبِيَّ ﷺ أَمْلَى عَلَيْهِ لاَ يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ وَالْمُجَاهِدُونَ فِي سَبِيلِ اللَّهِ قَالَ فَجَاءَهُ ابْنُ أُمِّ مَكْتُومٍ وَهُوَ يُمْلِيهَا عَلَىَّ فَقَالَ يَا رَسُولَ اللَّهِ وَاللَّهِ لَوْ أَسْتَطِيعُ الْجِهَادَ لَجَاهَدْتُ وَكَانَ رَجُلاً أَعْمَى فَأَنْزَلَ اللَّهُ عَلَى رَسُولِهِ ﷺ وَفَخِذُهُ عَلَى فَخِذِي فَثَقُلَتْ حَتَّى هَمَّتْ تَرُضُّ فَخِذِي ثُمَّ سُرِّيَ عَنْهُ فَأَنْزَلَ اللَّهُ عَلَيْهِ ( غَيْرُ أُولِي الضَّرَرِ )