That the Messenger of Allah (ﷺ) said: "Bring me a shoulder blade or tablet." Then he wrote: Not equal are those of believers who sit. 'Amr bin Umm Maktum who was behind him said: "Is there an exemption for me?" So the following was revealed: Except those who are disabled.
There are narrations on this topic from Ibn 'Abbas, Jabir and Zaid bin Thabit.
This Hadith is Hasan Sahih and it is a Hadith that is Gharib fromthe narration of Sulaiman At-Taimi from Abu Ishaq.
And Shu'bah and Ath-Thawri reported this Hadith from Abu Ishaq.