God Swears by Himself (Hebrews 6:13-20)

The author of Hebrews discusses that God's oath is confirmed by making the statement itself. (v.17).  This is because it is impossible for God to lie.  (v.18).  Interestingly, the author compares it to human oath by swearing on a person "greater than oneself", in order to confirm the oath.  (v.  16).

This is something largely out of practice, so it is a little hard to relate to.  Although people still say things like "I swear by God" and so forth.  What people do not do is make statements like "I swear by the King" or "I swear by the President of the United States".