Hebrews 7:28:

For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.

See also:

Objection: God Wouldn’t Heal Paul’s Thorn in the Flesh
Objection: Paul GLORIED in His INFIRMITIES – the Same Greek Word Used in Matthew 8:17 of What Jesus Took.  If Matthew 8:17 Refers to the Atonement, How Could Paul Glory in What Christ Took Away?