We have it by tradition that when Moses our Rabbi--peace be unto
him!--said in the law, "O God, the God of the spirits of all flesh"
(Num. xvi. 22), he meant mystically to intimate that metempsychosis
takes place in all flesh, in beasts, reptiles, and fowls. "Of all flesh"
is, as it were, "in all flesh."
THE KABBALA, _Avodath Hakodesh_, fol. 49, col. 3.