20 Therefore, anyone who swears by the altar swears by it and by everything on it.

Read Matthew 23:20 Using Other Translations

Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon.
So whoever swears by the altar swears by it and by everything on it.
When you swear ‘by the altar,’ you are swearing by it and by everything on it.