Menasseh ben Israel. De Creatione Problemata XXX.
Amsterdam, Menasseh ben Israel, 1635

Problema XV discusses the pre-existence of the souls; Menasseh adduces on p. 67 evidence from the Midrash ha-Ne'elam, the earliest part of the Zohar. Although Menasseh also freely quoted from pagan and Christian sources on the subject, he believed that the idea of pre-existence was essentially of Hebrew origin.