Galatians 3:18

For if the inheritance comes through obedience to Law, it no longer comes because of a promise. But, as a matter of fact, God has granted it to Abraham in fulfilment of a promise.

Luke 1:54-55

His servant Israel He has helped, Remembering His compassion--

Luke 1:72-73

He dealt pitifully with our forefathers, And remembered His holy covenant,

Romans 4:13-16

Again, the promise that he should inherit the world did not come to Abraham or his posterity conditioned by Law, but by faith-righteousness.

Romans 8:17

and if children, then heirs too--heirs of God and co-heirs with Christ; if indeed we are sharers in Christ's sufferings, in order that we may also be sharers in His glory.

Galatians 2:21

I do not nullify the grace of God; for if acquittal from guilt is obtainable through the Law, then Christ has died in vain."

Galatians 3:10

All who are depending upon their own obedience to the Law are under a curse, for it is written, "Cursed is every one who does not remain faithful to all the precepts of the Law, and practise them."

Galatians 3:12

and the Law has nothing to do with faith. It teaches that "he who does these things shall live by doing them."

Galatians 3:16

(Now the promises were given to Abraham and to his seed. God did not say 'and to seeds,' as if speaking of many, but 'and to your seed,' since He spoke of only one--and this is Christ.)

Galatians 3:26

You are all sons of God through faith in Christ Jesus;

Galatians 3:29

And if you belong to Christ, then you are indeed true descendants of Abraham, and are heirs in fulfilment of the promise.

Hebrews 6:12-15

so that you may not become half-hearted, but be imitators of those who through faith and patient endurance are now heirs to the promises.

Treasury of Scripture Knowledge

Summary

For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.

Bible References

If

Galatians 3:10
All who are depending upon their own obedience to the Law are under a curse, for it is written, "Cursed is every one who does not remain faithful to all the precepts of the Law, and practise them."
Galatians 2:21
I do not nullify the grace of God; for if acquittal from guilt is obtainable through the Law, then Christ has died in vain."
Romans 4:13
Again, the promise that he should inherit the world did not come to Abraham or his posterity conditioned by Law, but by faith-righteousness.
Romans 8:17
and if children, then heirs too--heirs of God and co-heirs with Christ; if indeed we are sharers in Christ's sufferings, in order that we may also be sharers in His glory.

But

Galatians 3:16
(Now the promises were given to Abraham and to his seed. God did not say 'and to seeds,' as if speaking of many, but 'and to your seed,' since He spoke of only one--and this is Christ.)
Luke 1:54
His servant Israel He has helped, Remembering His compassion--
Hebrews 6:12
so that you may not become half-hearted, but be imitators of those who through faith and patient endurance are now heirs to the promises.