Thomas Aquinas

He therefore that swears by the altar, swears by it and by all things that are upon it. Here he sets forth another reason. The temple contains the gold, and not conversely; similarly, the altar contains the gift, and not conversely. Hence he who swears by the temple swears by the gold that is in the temple; and he who swears by the altar, i.e., by the altar, swears by what is on it.

Commentary on Matthew ↗

Glossa Ordinaria

And lest their infatuation should go so far, that they should affirm that the gold was more holy than the temple, and the gift than the altar, He argues on another ground, that in the oath which is sworn by the temple and the altar is contained the oath by the gold or by the gift.

Catena Aurea by Aquinas ↗