Bible Verses About Unity of God: A ground for obeying him exclusively

Know therefore this day, and lay it to your heart, that the LORD himself is God in heaven above and on the earth beneath. There is no one else.

You shall keep his statutes, and his commandments, which I command you this day, that it may go well with you, and with your children after you, and that you may prolong your days in the land, which the LORD your God gives you, forever.