Hebrews 7:20

And since ¹  this was not done without a sworn affirmation – for the others have become priests without a sworn affirmation,

And it was not without an oath! Others became priests without any oath,

And inasmuch as it was not without an oath

God took an oath that Christ would always be a priest, but he never did this for any other priest.

The old priesthood of Aaron perpetuated itself automatically, father to son, without explicit confirmation by God.

And as this is not without the taking of an oath

This was confirmed with an oath; for others who became priests took their office without an oath,

And inasmuch as He was not made priest without an oath

And since ¹  this was not done without a sworn affirmation – for the others have become priests without a sworn affirmation,

¹ sn The Greek text contains an elaborate comparison between v. 20a and v. 22, with a parenthesis (vv. 20b-21) in between; the comparison is literally, “by as much as…by so much” or “to the degree that…to that same degree.”