The Aaronic Priesthood, under the Mosaic Law, was superseded by a new and better priesthood, that of The Lord Jesus Christ, He it was who was made High Priest having been appointed by God, a priest for ever, after the Order of Melchisedec. He was appointed under a new covenant, the Covenant of Grace. In Jesus Christ, God and the law having been satisfied, Christ became our substitute, sacrifice, surety, mediator and intercessor.