The Old Covenant is the law, but the New Covenant is also the law.
The Bible says that the Old Covenant law plays the role of our schoolmaster that leads us to Christ.

Galatians 3:24
So the law was put in charge to lead us to Christ that we might be justified by faith.

Here, The law is referring to the Law of Moses.
The Old Covenant law played the role of leading us to Christ who came the first time.

Whom does the New Covenant Law lead us to?

It leads us to Heavenly Mother. For this, Father came down to this earth again.
By restoring the Sabbath day the Passover and all the laws of the New Covenant that have been lost, distorted, and destroyed, Father established the path of salvation through which we can meet Heavenly Jerusalem mother and return to the eternal kingdom of Heaven.

This is why god the father gave us the teaching in the bible that we should listen to everything god the mother says.

Genesis 21:8
The child grew and was weaned, and on the day Isaac was weaned Abraham held a great feast.
But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking,
and she said to Abraham, "Get rid of that slave woman and her son, for that slave woman's son will never share in the inheritance with my son Isaac."

The matter distressed Abraham greatly because it concerned his son.

God said, "Listen to whatever Sarah tells you."

When we study the history of Abraham's family, Sarah represents God the Mother.

Through the history of Abraham's family, we can understand the position of Sarah, through whom we can realize the truth regarding Heavenly Mother.