Galatians 3:18

For if the inheritance is based on the law, it is no longer based on a promise; but God gave it to Abraham by a promise.

Luke 1:54-55

He has helped his servant Israel, in remembrance of his mercy,

Luke 1:72-73

To perform the mercy promised to our fathers and to remember his holy covenant,

Romans 4:13-16

The promise to Abraham and his descendants, that he would be heir of the world, was not through the law but through the righteousness of faith.

Romans 8:17

and if children, then heirsheirs of God and fellow heirs with Christ, if indeed we suffer with him, in order that we may also be glorified with him.

Galatians 2:21

I do not nullify the grace of God, for if righteousness comes through the Law, then Christ died for nothing."

Galatians 3:10

For all who rely on works of the law are under a curse; for it is written, "Cursed is everyone who does not abide by all things written in the book of the law, to do them."

Galatians 3:12

But the Law is not of faith; on the contrary, "He who does them shall live by them."

Galatians 3:16

Now the promises were spoken to Abraham and to his seed. He does not say, "And to seeds," as referring to many, but rather to one, "And to your seed," that is, Christ.

Galatians 3:26

For you are all sons of God, through faith in Christ Jesus.

Galatians 3:29

And if you belong to Christ, then you are Abraham's offspring, heirs according to promise.

Hebrews 6:12-15

so that you may not be sluggish, but imitators of those who through faith and patience inherit 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
For all who rely on works of the law are under a curse; for it is written, "Cursed is everyone who does not abide by all things written in the book of the law, to do them."
Galatians 2:21
I do not nullify the grace of God, for if righteousness comes through the Law, then Christ died for nothing."
Romans 4:13
The promise to Abraham and his descendants, that he would be heir of the world, was not through the law but through the righteousness of faith.
Romans 8:17
and if children, then heirsheirs of God and fellow heirs with Christ, if indeed we suffer with him, in order that we may also be glorified with him.

But

Galatians 3:16
Now the promises were spoken to Abraham and to his seed. He does not say, "And to seeds," as referring to many, but rather to one, "And to your seed," that is, Christ.
Luke 1:54
He has helped his servant Israel, in remembrance of his mercy,
Hebrews 6:12
so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.