Ok, if you mean that Christ had a beginning to His Priestly duties:
So also Christ glorified not Himself to be made a high priest, but He that said unto Him, "Thou art My Son; today have I begotten Thee." And He saith also in another place, "Thou art a priest for ever after the order of Melchizedek."I also believe He is now eternal, having been resurrected, ascended and glorified seated at Yahweh's right hand. I also believe this is what the original believers{converted Jews} also believed.
Jesus Christ is the same yesterday, and today, and for ever.Jesus in the beginning laid the foundation of the earth; the heavens are the work if His hands. They will change, but He is the same.