Sayyiduna Abu Musa (may Allah be pleased with him) said: "I saw the Messenger of Allah (peace and blessings be upon him) wiping over socks and sandals." (b) The hearing of al-Dahhak bin Abd al-Rahman from Abu Musa is not established, and in it is Isa bin Sinan, who is da'if (weak) and cannot be used as evidence. (c) Imam Yahya bin Ma'in (may Allah have mercy on him) said: Isa bin Sinan is weak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1351