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).” ‘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).” (Sahih)