The Limits of Ablution, Its Order and Reward
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 11
وَقَالَ أَمِيرُ اَلْمُؤْمِنِينَ عَلَيْهِ اَلسَّلاَمُ: «لَوْ لاَ أَنِّي رَأَيْتُ رَسُولَ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ يَمْسَحُ ظَاهِرَ قَدَمَيْهِ لَظَنَنْتُ أَنَّ بَاطِنَهُمَا أَوْلَى بِالْمَسْحِ مِنْ ظَاهِرِهِمَا.
The Commander of the Faithful Imam Ali ibn Abi Talib عليه السلام said: "If I had not seen the Messenger of Allah صلى الله عليه وعلى آله وسلم wiping over the tops of his feet, I would have thought that the soles of the feet should be wiped instead of the tops”.
- Ṣaḥīḥ al-Faqīh