Again, you have heard that it has been said by them of old time, You shall not perjure yourself, but shall perform unto the Lord your oaths:
All Commentaries on Matthew 5:33 Go To Matthew 5
John Chrysostom
AD 407
Why did He go straightway not to theft, but to false witness, passing over that commandment? Because he that steals, does upon occasion swear also; but he that knows not either swearing or speaking falsehood, much less will he choose to steal. So that by this He has overthrown the other sin likewise: since falsehood comes of stealing.