זוהר שמות — דף קסח ע”ב

All the elements belonging to the secret of the hidden supernal world have the letter He concealed there to show the world is buried and hidden. On the other side, in places where the letter is missing from allusions to the supernal secret, the Shekhinah exceeds that count without being in the count. The secret of names and missing or extra letters in the holy text alludes to the reckoning of the supernal sefirot. The supernal holiness subtracts a letter on the holy side and adds it on the impure side, and the allusion reveals the deep secret.