Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
What is the ruling on organ donation?
It is impermissible to take a dead person’s organs. Some scholars allow someone to donate an organ such as a kidney if they can do without it, especially if they are donating it to someone close to them such as their father or mother and doing so would save their life. It would not be permissible to donate your eye or your hand for example because you do not in fact own your own organs but rather they belong to Allah. It is permissible to donate blood because it replaces itself and donating it does not detract from a person’s makeup.