Matthew 5:33-37 Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’ (34) But I say to you, Do not take an oath at all, either by heaven, for it is the throne of God, (35) or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. (36) And do not take an oath by your head, for you cannot make one hair white or black. (37) Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil.
Matthew 23:16-22 Woe to you, blind guides, who say, ‘If anyone swears by the temple, it is nothing, but if anyone swears by the gold of the temple, he is bound by his oath.’ (17) You blind fools! For which is greater, the gold or the temple that has made the gold sacred? (18) And you say, ‘If anyone swears by the altar, it is nothing, but if anyone swears by the gift that is on the altar, he is bound by his oath.’ (19) You blind men! For which is greater, the gift or the altar that makes the gift sacred? (20) So whoever swears by the altar swears by it and by everything on it. (21) And whoever swears by the temple swears by it and by him who dwells in it. (22) And whoever swears by heaven swears by the throne of God and by him who sits upon it.