Praise be to Allah.
It is not permissible to withdraw blood from patients for the purpose of learning and training, even if there is no hope of the patients recovering, because that is harming them and wronging them. But if the patient is compos mentis and gives permission for blood to be taken in the interests of others, there is nothing wrong with that, so long as he will not be harmed thereby.
And Allaah is the Source of strength, may Allaah send blessings and peace upon our Prophet Muhammad and his companions and family. End quote.
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