Musannaf Ibn Abi Shaybah 28816 — The foot: how much is due for it?

Amr bin Shu'ayb said that among the rulings laid down by Sayyiduna Abu Bakr and Sayyiduna Umar (may Allah be pleased with them both) is that when the owner of a foot opens out his foot and cannot fold it, or folds it and cannot open it out, or lifts it from the ground and cannot put it back, then for whatever is lacking the compensation will be according to its proportion.