Today’s passage is Hebrews 7:20-28. Let’s go!
Hebrews 7:21 (NIV)
21 but he became a priest with an oath when God said to him: “The Lord has sworn and will not change his mind: ‘You are a priest forever.'”
On verses 20-21: In a court of law, before a witness takes the stand, the witness makes a solemn promise, swearing to tell the truth. This is called an oath. The oath is meant to show that the person speaking is completely serious and sincere about the words he or she is about to speak and that his hearers can count on what he or she is saying. Likewise, when God spoke words to appoint Jesus as a priest, God swore an oath to show how serious and sincere He was about the pronouncement He was making.
Whereas others naturally became priests by being born into the tribe of Levi, Jesus supernaturally became a priest by way of God’s oath or promise. It’s similar to what happened with Abraham’s two sons, Ishmael and Isaac. First there was Ishmael who was conceived in an ordinary, natural, man-made way. But then came Isaac, who was conceived supernaturally as the result of God’s promise (see Romans 9:9 and Galatians 4:23). Jesus became a priest because of a promise.