MOUNT ZION = TORAH WRITTEN UPON A HEART OF FLESH SPIRIT OF THE LAW = CIRCUMCISED HEARTS

Galatians 4:22 For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.

Galatians 4:23 But he who was of the bondwoman was born after the flesh but he of the freewoman was by promise.