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

know today, and establish it in your heart, that ADONAI is God in heaven above and on earth below - there is no other.

Therefore, you are to keep his laws and mitzvot which I am giving you today, so that it will go well with you and with your children after you, and so that you will prolong your days in the land ADONAI your God is giving you forever."