The ruling on donating blood in exchange for a gift

Question:
The nature of the thing is that it has been struck by the sun without any benefit.

Answer:
There is no harm in donating blood, because here it is an act of kindness. If a person is capable of donating and it does not affect his health, and the doctors examine him before this, examining him to see if he is capable or not, then if he is capable, his donation of blood is good and an act of kindness from him. However, he must not take anything in return for it, because it is not permissible to sell blood; blood is forbidden, and if Allah forbids something, He forbids its price. If a person donates blood hoping for a gift, or donates blood for the sake of the gift, this is not permissible because he has wasted it. But if he donates blood as an act of kindness and does not look for anything, but something is given to him afterwards, there is no harm in that because he did not seek it. And it is better for him to leave it. But if he did not intend it and did not look for it, there is no point in saying yes.