Mu'jam Kabir Tabarani 4870 — I used to write down the revelation

Sayyiduna Zayd bin Thabit (may Allah be pleased with him) narrates: I used to write down the revelation for the Messenger of Allah (peace and blessings be upon him). When revelation came down upon him (peace and blessings be upon him), he (peace and blessings be upon him) would be seized by intense distress and would sweat profusely, with drops like pearls; then this state would lift from him. I would go in to him (peace and blessings be upon him) with a piece of a camel saddle or some other fragment to write on, and I would write while he (peace and blessings be upon him) dictated to me. I would not yet have finished when my feet would be close to breaking from the weight of the Qur'an, until I would say: Now I shall never be able to walk on my feet again. When I finished, he (peace and blessings be upon him) would say: "Read it." If anything had been left out of it, he (peace and blessings be upon him) would have it corrected; then I would take it out to the people.