Adam Clarke on Matthew 27:6

The treasury - Κορβαναν - the place whither the people brought their free-will offerings for the service of the temple, so called from the Hebrew קרבן korban, An Offering, from קרב karab, he drew nigh, because the person who brought the gift came nigh to that place where God manifested his glory between the cherubim, over the mercy-seat in the most holy place. It is from this idea that the phrase to draw nigh to God is taken, which is so frequently used in the sacred writings.

Because it is the price of blood - "What hypocrites, as one justly exclaims, to adjudge an innocent man to death, and break the eternal laws of justice and mercy without scruple, and to be, at the same time, so very nice in their attention to a ceremonial direction of the law of Moses! Thus it is that the devil often deludes many, even among the priests, by a false and superstitious tenderness or conscience in things indifferent, while calumny, envy, oppression of the innocent, and a conformity to the world, give them no manner of trouble or disturbance." See Quesnel.