Do jurists represent the absorption of impurity by a knife, and does a knife absorb impurity even though it is made of iron?

Question:
He says: Honorable Shaykh, may Allah grant you success. Do the jurists (may Allah have mercy on them) represent the absorption of impurity by a knife, and does a knife absorb impurity even though it is made of iron?

Answer:
Yes, the knife and the iron absorb impurity, and they absorb poison, and therefore there are poisoned weapons, refuge with Allah. If a person is struck, or if the knife strikes something, the poison spreads in the body and the person dies. So the iron absorbs it because they heat it with fire and then pour this substance on it, so it enters into it, and it cannot be removed from it afterwards.