I said to Abi Ja’far عليه السلام: will you not inform me how you knew and ruled that the wiping should only be limited to a part of the head and a part of the feet, so he laughed and then said: O Zurara – the messenger of Allah ruled it to be so and the Book from Allah descended with it – because Allah Mighty and Majestic says: “wash your faces” so we understood that the whole face … then he said: “and wipe part of your head” so we understood when He said بِرُءُوسِكُمْ that the wiping is limited to part of the head because of the (letter) ‘ب’ (Ba) …