There and then Ibrahim bequeathed this rich legacy to his sons as later did his grandson Ya’qub (Jacob); they both enjoined their sons to the same belief. "O my Sons", they said, "Allah has chosen for you a particular system of faith and worship, you are enjoined to observe and practice it, therefore, adhere to it so that when death lays its hands upon you, and you pass through his door you will have conformed your will to Allah's blessed will".