3:20

there is no mediator when just one person is involved: Paul is discussing the covenant that Jehovah made with Abraham. Jehovah made this covenant or promise, and it was up to Him to fulfill it. He set forth no conditions that Abraham had to meet. (Ga 3:18) On the other hand, the Law covenant involved two parties. It was made between Jehovah and the nation of Israel, with Moses as mediator. (See study note on Ga 3:19.) The Israelites agreed to the terms of the covenant, making a sacred promise to obey the Law.​—Ex 24:3-8; Ga 3:17, 19; see Glossary “Covenant.”

God is only one: Greek manuscripts read “God” here, but a few translations of the Christian Greek Scriptures into Hebrew and other languages use the divine name. Paul’s statement echoes the words of De 6:4, which reads: “Jehovah our God is one Jehovah.” Jesus quotes from De 6:4, as recorded at Mr 12:29. (See study notes.) Paul alludes to the same scripture at Ro 3:30 and 1Co 8:4.