Musannaf Ibn Abi Shaybah

Hazrat Hakam bin A'raj says that I asked Ibn Umar (may Allah be pleased with them) about wiping over leather socks (khuffs). He replied that at the place of Jalula, there was a disagreement between me and Hazrat Sa'd regarding wiping over leather socks. Hazrat Sa'd used to say to wipe over the socks, while I used to deny it. When we presented ourselves before Hazrat Umar, I mentioned this matter to him and said that Hazrat Sa'd says to wipe over the socks after breaking wudu. Hazrat Umar said: Wipe over them even after relieving yourself, and wipe over them even after breaking wudu.