Hilary of Poitiers

For since Christ is come, reliance upon the Law is vain; for not Christ by the Law, but the Law by Christ, is sanctified, in whom it rests as on a seat or throne; so are they fools and blind, who, overlooking the sanctifier, pay honour to the things sanctified.

Catena Aurea by Aquinas ↗

Thomas Aquinas

Then he sets forth the refutation: you foolish and blind; for which is greater, the gold or the temple that sanctifies the gold? It is evident that what is in the temple is holy by reason of the temple; hence he who steals anything in the temple commits sacrilege. Hence it is greater to swear by the temple than by the gold. Chrysostom says: this is against certain people who say that to swear by God is nothing. …

Commentary on Matthew ↗