Murdering one's own self is forsure a major sin and is strictly forbidden in the religion of Islam, in accordance to various text evidence and the prohibition of it in early religious divine laws. But, there has been a one time incident when the Prophet Moses was sent to Banu Israel [1]. God the Almighty says in the holy Qur'an: (Remember when Moses returned with the Divine Book (Torah) to his people and said: "O my people!