Musannaf Ibn Abi Shaybah

Ishaq narrates that Hazrat Sa’d bin Abi Waqqas came out of the toilet, performed ablution, and wiped over his socks. Someone said to him, “You have come out of the toilet and are wiping over your socks?” He replied, “Yes, if you have worn the socks while your feet were clean, then wipe over them, and do not remove them except in the case of major impurity (janabah).”