Musannaf Ibn Abi Shaybah 1951 — Those who set no time limit for wiping

Ishaq said: Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) came out of the toilet, performed ablution and wiped over his khuffs (leather socks). Someone said to him: "You have come out of the toilet and you wipe over your khuffs?" He said: "Yes. If you put on the khuffs while your feet were pure, then wipe over them, and do not take them off except for janabah (major ritual impurity)."