I want to flag this for further consideration:
“Abraham was fully aware of the magical and idolatrous uses that could be developed from these mysteries. The Talmud thus says that Abraham had a tract dealing with idolatry that consisted of 400 chapters. There is also a Talmudic teaching that Abraham taught the mysteries involving ‘unclean names’ to the children of his concubines. This is based on the verse, ‘to the sons of the concubines that Abraham had, Abraham gave gifts, and he sent them away…to the lands of the east’ (Genesis 25:6). These gifts consisted of occult mysteries, which then spread in eastern Asia.”— Aryeh Kaplan, Sefer Yetzirah: The Book of Creation in Theory and Practice (xiii–xiv)
This, combined with Kaplan’s observation that the work of creation ought to be undertaken by a pair of men, places this tale of origins alongside the rich vein of Tamar stories that I spoke about previously.