זוהר שמות — דף קסז ע”ב

The human form is engraved at birth, and the seed is light. The light of every man seed is mingled with the light of his father, and when he is born into the world, that paternal light is hidden within him and sunken. The Tabernacle and the human being share one secret - each includes the other. The soul of a person is bound to his supernal neshamah, just as the Tabernacle is bound to the Shekhinah. The letter Yod appears in the seed which carries a hidden holy light, and the neshamah itself is a hidden light.