Sunan Ibn Majah

It was narrated from Ubayy bin 'Imarah, in whose house the Messenger of Allah performed prayer facing both prayer direction, that :He said to the Messenger of Allah: ""Can I wipe over my leather socks?"" He said: ""Yes."" He said: ""For one day?"" He said: ""For two days?"" He said: ""For three?"" And so on, until the number reached seven. He (the Prophet) said: ""For as long as you see fit