Matthew 23:17
You blind fools! For which is greater, the gold or the temple that has made the gold sacred? The rhetorical question exposes the incoherence of the oath-casuistry: the gold of the temple is sacred because of the temple, not vice versa. The gold's sanctity derives from the temple's sanctity; swearing by the gold of the temple invokes the temple's holiness whether one acknowledges it or not.