The covenant of circumcision was first given to Abram. At the same time him and Sarah received a name change.The covenant continued through Moses. Moses added a vision of an end time heart circumcision to be performed by Yahuah on the heart of his people. No amount of religious devotion could produce it. Jeremiah added a vision of a heart circumcision which the people could perform themselves. The Apostle Paul revealed details of the end time heart circumcision indicating it was performed by the Messiah on the inner man of the saints. When the saint believed in the death, burial and the resurrection of Messiah he himself died, and was raised with Messiah. This was the circumcision of the flesh the removal of a sinful nature. Sefer Yetzirah revealed that Yahuah gave two circumcisions to Abraham, that of the male organ and that of the tongue. The latter was the speaking of the mysteries of the Torah. The hidden power of physical circumcision was not salvation but identification and obligation.