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 صلى الله عليه وسلم 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 ‏}‏ ‏.‏