The ruling on selling for an unspecified price, and selling blood and donating it

The questioner:
If the price is to be paid within one year, it would be, for example, ten thousand; if within two years, it would be twelve thousand. This is permissible.

The Shaykh:
This is what is permissible; because the sale has not been finalized. The price in a sale must be known. This price is not known now; it has not become known.

The questioner:
It is greater than the hadith prohibiting security. Let us finish with

The Shaykh:
Hani, this is a sale where the price is not known. He says the first year is at one hundred, and the second year is at one hundred and fifty. This is an invalid sale because the price has not been determined. One of the conditions for the validity of a sale is that the price be known in amount at the time of the contract. Yes.

The questioner:
Yes.

The Shaykh:
Selling blood is not permissible. Selling blood is not permissible.

The questioner:
In mental hospitals, in exchange for.

The Shaykh:
If they give it without any condition and without anything, there is no harm. This would be permissible, or a gift, or encouragement. So if they offer it of their own accord without any condition, there is no harm. But if they impose a condition and say, "I will not give you blood unless you give me such and such," or if no condition was stated but they intended that thing and aimed at it, this is not permissible. Because selling blood is not permissible; it is forbidden. As for donating it, there is no harm for the sake of the patients' need. Donating it is a matter of dire necessity. Allah the Exalted said: So the patient reaches a state where he needs blood, and if he does not receive this blood, he will suffer harm or death. This is a matter of dire necessity. But taking a price for it is not permissible. Yes.