'I Will Be Your God' in the Bible

I also explicitly commanded them: "Obey me. If you do, I will be your God and you will be my people. Live exactly the way I tell you and things will go well with you."

Those are the terms that I charged your ancestors to keep when I brought them out of Egypt, that place which was like an iron-smelting furnace. I said at that time, "Obey me and carry out the terms of the agreement exactly as I commanded you. If you do, you will be my people and I will be your God.

Then you will again be my people and I will be your God.