(5) باب المسح على الخفين
Narrated Ubai bin 'Imara (rad):
I asked, "O Messenger of Allah, may I wipe over the Khuffain (leather socks)?" The Prophet (ﷺ) replied, "Yes". I asked, "For one day?" He replied, "For one day", I again asked, "And for two days?" He replied "For two day s too". I again asked "And for three days" He replied, "Yes, as long as you wish". [Reported by Abu Da'ud, who said, "It is not strong"]
Reference: Bulugh al-Maram 66
In-book reference: Book 1, Hadith 76
English translation: Book 1, Hadith 71