Deuteronomy 6:13

¹³ Let the fear of the Lord your God be in your hearts, and be his servants, taking your oaths by his name.

Isaac

'Isaac' signifies the Lord's interior self and His divine rational in reference to divine good.

¹⁹ God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Isaac. I will establish my covenant with him for an everlasting covenant for his seed after him.