﴾وَوَصَّى بِهَا﴿ “And he instructed” with the words of Islam; humbling oneself to the commands of Allah U and to hold fast to them, as well as to worshipping Allah. “Wasiah” is the final word a person says in this world before his death. So, he is sincere in saying it to the ones he loves, such as a father giving his sons parting advice when he is about to pass away. This parting advice (wasiah) contains the summary and experiences of life. And at the approach of death, there would not be any form of lying or cheating, rather the parting advice of a person to his children would have sincere counsel and benefit for them or to others he leaves behind.