Musannaf Ibn Abi Shaybah 39116 — The leftover of a cat: Abu Hanifah

Abdullah bin Sa'id narrates from his grandfather that he said: I saw Sayyiduna Ali (may Allah be pleased with him) urinate at al-Rahbah, then he wiped over his socks and sandals. And it is mentioned that the view of (Imam) Abu Hanifah is: he considered wiping over socks and sandals to be disliked (makruh), unless the undersides of the socks are covered with leather.