Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
malik:2-45Yaḥyá > Mālik > Hishām b. ʿUrwah > Raʾá Abāh Yamsaḥ > al-Khuffayn

Yahya related to me from Malik from Hisham ibn Urwa that he saw his father wiping over his leather socks. He said, "When he wiped over his socks he would never do more than wipe the tops and he would not wipe the bottoms."  

مالك:٢-٤٥حَدَّثَنِي يَحْيَى عَنْ مَالِكٍ عَنْ هِشَامِ بْنِ عُرْوَةَ أَنَّهُ رَأَى أَبَاهُ يَمْسَحُ عَلَى الْخُفَّيْنِ

قَالَ وَكَانَ لاَ يَزِيدُ إِذَا مَسَحَ عَلَى الْخُفَّيْنِ عَلَى أَنْ يَمْسَحَ ظُهُورَهُمَا وَلاَ يَمْسَحُ بُطُونَهُمَا