It was narrated from Al-Bara' that the Prophet ﷺ said:

"bring me a shoulder blade of a camel, or a tablet, and write: Not equal are those of the believers who sit (at home)." [1] 'Amr bin Umm Maktum was behind him and he said: "Is there a concession for me?" Then the following was revealed: "Except those who are disabled (by injury or are blind or lame)." [2]

[1] An-Nisa' 4:95.
[2] An-Nisa' 4:95.

أَخْبَرَنَا نَصْرُ بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا مُعْتَمِرٌ، عَنْ أَبِيهِ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْبَرَاءِ، أَنَّ النَّبِيَّ ﷺ ثُمَّ ذَكَرَ كَلِمَةً مَعْنَاهَا قَالَ " ائْتُونِي بِالْكَتِفِ وَاللَّوْحِ " . فَكَتَبَ { لاَ يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ } وَعَمْرُو بْنُ أُمِّ مَكْتُومٍ خَلْفَهُ فَقَالَ هَلْ لِي رُخْصَةٌ فَنَزَلَتْ { غَيْرُ أُولِي الضَّرَرِ } .