Or is it earlier than that? "Let us Make Man in Our *Image*"--2 Cor. 3:18 But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as from the Lord, the Spirit.;And the promise of Christ first appears in Genesis 3:15.
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Romans 8:29 For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers.