Lower Shekhinah, who is an ‘exchange’, of that of which it is written: based upon Exodus 23:21: “Do not ‘exchange’ Me for him...” – and they are Hei-Hei ה־ה, And this (zot) – this is ‘Son and Daughter’, Israel – this is Father.
The Lower Shekhinah as an Exchange in Exodus
Tikkunei Zohar 121:1