Arcana Coelestia # 2074
2074. That 'will one be born to a son of a hundred years?' means that in that case the Rational belonging to the Lord's Human Essence would be united to the Divine Essence is clear from the meaning of 'a hundred', regarding which see above, in 1988.
Genesis 17:13
13
He who is born in your house, and he who is bought with your money, must be circumcised. My covenant will be in your flesh for an everlasting covenant.