They are surely My people: God's ownership and commitment to his people were central to the agreement (see Isaiah 43:1).
who will not be disloyal: The Lord expected his people to honor their relationship with him, unlike other nations, whose history is full of betrayal (Genesis 3–11). But Israel also betrayed their God (Isaiah 63:10).
their Savior: God saved and protected his people (see Isaiah 43:3).