Matthew 5:33 King James Version (KJV)

33 Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:

Matthew 5:33 Common English Bible (CEB)

Law of solemn pledges

33 “Again you have heard that it was said to those who lived long ago: Don’t make a false solemn pledge, but you should follow through on what you have pledged to the Lord