Shuraih bin Hani says that I asked Lady Aisha Siddiqa (may Allah be pleased with her) about a male companion regarding wiping over leather socks, so she said: "You should ask this question to Sayyiduna Ali (may Allah be pleased with him), because he used to accompany the Prophet (peace be upon him) on journeys." So I asked Sayyiduna Ali (may Allah be pleased with him), and he said: "The Prophet (peace be upon him) commanded us that when we go on a journey, we should wipe over our leather socks."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 949
Hadith Gradingحکم دارالسلام:صحيح لغيره، م: 276، شريك النخعي قد توبع