What is the ruling on donating body organs?

Question : Your Eminence the Shaykh, is it permissible for a person to give in charity a part of his body, such as the heart or others?

Answer : By Allah, if he donates his heart, it is a knot, and by Allah, these are wonders. No, after death, that is the end. If the heart dies, in any case, what we see is that it is not permissible for a person to donate any of his organs, even if he remains alive after donating that organ. For example, it is well known that if a person donates one of his kidneys, he remains alive, but it is not permissible. Because your organ, rather, because your entire body, even the skin, is a trust in your care, and it is not permissible for you to dispose of it ever. If a person said, "I want to cut off the tip of my little finger," we would say, "No, this is forbidden for you." So how can you donate a kidney?
Is this not something that may burden the remaining kidney with a lot of work, causing it to be corrupted? Allah the Exalted is Wise; He did not place two kidneys except for the benefit of the body. Then, if a disease befalls the remaining one and it stops functioning, what will happen? Death, inevitably. Even if the one that was donated remains, it would have filled the role of the sick one. Furthermore, it may be transplanted into the patient, and the body may not accept it. And if it accepts it, it accepts it with difficulty and a constant need for medication. It may remain for a period and then dissolve.
Therefore, we hold that organ donation is forbidden, even after death. The jurists have explicitly stated this, my brothers. We are not saying something from ourselves; the jurists have stated it. Look at it in the chapter on washing the dead in the book al-Iqna' from the books of the Hanbalis: it is not permissible to cut an organ from a dead person, even if he bequeathed it. Look, even fingers. If he said, "After my death, take the kidney for my son, or my daughter, or my sister, or my aunt, or my maternal aunt, or my mother, or my father?"
We say, "No." If you do not die today, you will die tomorrow. For this reason, when the Angel of Death came to Moses (peace be upon him) to take his soul, Moses did not want the Angel of Death to take his soul, and he struck him until he returned to Allah and said, "O my Lord, You sent me to a man who does not want to die, and none of us wants to die." Fine. But Allah the Mighty and Majestic said to him, "Go to him and say, 'Place your hand on the skin of a bull, and for every hair under your hand, he will have a corresponding number of years.'"
Under my hand? A great number, without doubt, and the bull's hair is fine. So he returned to Moses and said, "This is the word of Allah the Mighty and Majestic." He said, "Then what?" He said, "Then death." He said, "From now?" "From now." But I ask Allah to bring me close to the Holy Land, a stone's throw away. Allah accepted that and brought him close to the Holy Land, a stone's throw away. The Prophet (peace and blessings be upon him) said, "And his grave is at the red sand dune there. If I were there, I would show it to you." For this reason, there is no known grave of a prophet except one from? Muhammad and the Messenger of Allah (peace and blessings be upon him). The other prophets do not have known graves. It is true that they are in a certain direction, but you cannot determine the location of the grave.