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Neither the old covenant nor the new covenant are "according to promise"."And if you belong to Christ, then you are Abraham's descendants, heirs according to the promise." (Galatians 3:29 NET)Romans 4:16 NET For this reason it is by faith so that it may be by grace, with the result that the promise may be certain to all the descendants - not only to those who are under the law, but also to those who have the faith of Abraham, who is the father of us all.
The covenant referred to in Gal 3:8-9 is the one in Genesis 17 and not the one in Exodus 19.