Sayyiduna Zaid bin Thabit (may Allah be pleased with him) said: I was sitting with the Messenger of Allah (peace and blessings be upon him) when tranquility (sakinah) descended upon him, and his thigh fell upon my thigh. I never felt anything heavier than the thigh of the Messenger of Allah (peace and blessings be upon him). Then, when the tranquility ended, he said: "Write." So I wrote this verse on a shoulder blade: "Those of the believers who sit (at home), except those who are disabled, are not equal to those who strive in the way of Allah" [to the end of the verse] . Then Ibn Umm Maktum, who was blind, stood up, and when he heard the virtue of the Mujahideen, he said: "O Messenger of Allah! What about those believers who do not have the strength for jihad?" Sayyiduna Zaid (may Allah be pleased with him) says: When Ibn Umm Maktum finished his words, tranquility descended again upon the Messenger of Allah (peace and blessings be upon him), and his thigh again fell upon my thigh. I felt the same weight as the first time. Then, when it ended, the Messenger of Allah (peace and blessings be upon him) said: "O Zaid! Recite." So I recited: "Those of the believers who sit (at home)..." He (peace and blessings be upon him) said: "Except those who are disabled," the whole verse. Sayyiduna Zaid (may Allah be pleased with him) says: This phrase was revealed separately by Allah, so I joined it. And by Him in Whose hand is my soul, it is as if I am seeing the joining of it in the gap of the place where I wrote it on the shoulder blade.