جامع الترمذي

Narrated Sahl bin Sa'd As-Sa'idi: "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."