זוהר שמות — דף קפ ע”ב

When the light of the candle strikes the letter Yod, three points extend from it — two above as the head, one below as its thorn. From this extension, a palace (Heikhal) is created for the first point, in which the secret of the letter is concealed. The letter Heh rests on five pillars emerging from the candle, and from there produces five more, existing in the secret of ten. When it separates, the Heh stands upon the thirteen attributes of mercy with an added degree. There are large letters above and small letters below, for all that is below mirrors what is above.