John Gill Reformed Baptist @doctorgill

When a man swears by the temple, he swears not merely by stones and timber, which cannot witness anything, but necessarily by God who dwells there. The temple has no power to bind an oath; only God does. So to swear by the temple is to swear by God Himself, whether the swearer intends it or not, and his word must be held sacred accordingly.

AI summary

Jamieson-Fausset-Brown Reformed @jfbcommentary

Whose therefore shall swear by the altar, &c.--See on Mat 5:33-37.