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Is this a pop quiz?
From Exodus to Malachi God's people were under the Sinaitic Covenant,
which had been added to the Abrahamic Covenant of Ge 17.
In terms of the way you frame it, there is only one covenant after the Sinaitic Covenant was made obsolete (Heb 8:13),
and that is the New Covenant made in the blood of Christ and inaugurated at his death (Lk 22:20).
The Bible knows only seven covenants, and the covenant with Phinehas (Nu 25:10-31) is one of them.
Of the seven, five are unconditional.
Only the unconditional ones are effectively eternal and everlasting.
They are all eternal and everlasting in the sense that God kept his part, he is not the one who broke it.
Only the unilateral covenants are not conditional, but eternal and unconditional.
Specifically, or by voluntary inclusion with the Jews?
Only one covenant for God's people themselves remains now; i.e., the New Covenant.
The Noahic Covenant is for all mankind, as well as for every living thing on earth.
So what does this have to do with Mt 21:43?
From Exodus to Malachi God's people were under the Sinaitic Covenant,
which had been added to the Abrahamic Covenant of Ge 17.
In terms of the way you frame it, there is only one covenant after the Sinaitic Covenant was made obsolete (Heb 8:13),
and that is the New Covenant made in the blood of Christ and inaugurated at his death (Lk 22:20).
The Bible knows only seven covenants, and the covenant with Phinehas (Nu 25:10-31) is one of them.
Of the seven, five are unconditional.
Only the unconditional ones are effectively eternal and everlasting.
They are all eternal and everlasting in the sense that God kept his part, he is not the one who broke it.
Only the unilateral covenants are not conditional, but eternal and unconditional.
Specifically, or by voluntary inclusion with the Jews?
Only one covenant for God's people themselves remains now; i.e., the New Covenant.
The Noahic Covenant is for all mankind, as well as for every living thing on earth.
So what does this have to do with Mt 21:43?
We see it very differently and I wont convince you and you wont convince me.