What is the ruling on transferring blood from one person to another?

Al-Hawini: Some people have said that blood transfusion is not permissible because blood is ritually impure. Is this ruling correct?

The Shaykh : No, because blood is not ruled to be ritually impure until it separates from the body and exits into the air. If it is transferred, as is known today, directly from vein to vein, we see no harm in that. This is on the assumption that the spilled blood of a Muslim is ritually impure. However, the stronger position in our view is that it is pure, based on the evidence of the righteous predecessors praying while their wounds were bleeding, and based on the story of that Ansari who was struck by the evil eye from the polytheists repeatedly until blood flowed from his leg, while he continued in his prayer and did not break it. This story is well known. The blood coming out of him was not something that would invalidate his prayer or break his ablution. Therefore, there is leniency in this matter, even if blood comes out.