Exodus 3:15 ESV
God also said to Moses, “Say this to the people of Israel, ‘The Lord, the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you.’ This is my name forever, and thus I am to be remembered throughout all generations.
God is known and experienced in one way by the people of Israel and in another way by the body of Christ. To Israel He is the God of our fathers.
To the body of Christ He is known as Father, our Father. No one knows this name unless God gives it to that person. This is His new name for a new man reborn into the house of the Father. We take the name of His Son Christ Jesus.
Both names are forever. God is known by His revelation and our experience and relationship with Him.