Galatians 3:18

For, if the inheritance is of the law, it is no longer of promise; but God has freely given it to Abraham through promise.

Luke 1:54-55

He succored Israel His servant, to remember mercy,

Luke 1:72-73

to show mercy towards our fathers, and to remember His holy covenant;

Romans 4:13-16

For, not through law, was the promise to Abraham, or to his seed, that he should be heir of the world, but it was through the righteousness of faith.

Romans 8:17

and, if children, heirs also; heirs, indeed, of God, and joint-heirs with Christ; if, indeed, we suffer with Him, that we may be also glorified with Him.

Galatians 2:21

I do not set aside the grace of God; for, if righteousness is through law, then Christ died needlessly!

Galatians 3:10

For as many as are of works of law are under a curse; for it has been written, "Cursed is every one who continues not in all the things written in the book of the law, to do them."

Galatians 3:12

Now the law is not of faith; but "He who did them shall live in them."

Galatians 3:16

Now to Abraham were the promises spoken, and to his Seed. He saith not, "And to seeds," as of many; but as of One, "and to your Seed"; which is Christ.

Galatians 3:26

for ye are all sons of God through faith in Christ Jesus;

Galatians 3:29

And, if ye are Christ's, ye are, consequently, Abraham's seed, and heirs according to promise.

Hebrews 6:12-15

that ye may not become slothful, but imitators of those who, through faith and long-suffering, 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 as many as are of works of law are under a curse; for it has been written, "Cursed is every one who continues not in all the things written in the book of the law, to do them."
Galatians 2:21
I do not set aside the grace of God; for, if righteousness is through law, then Christ died needlessly!
Romans 4:13
For, not through law, was the promise to Abraham, or to his seed, that he should be heir of the world, but it was through the righteousness of faith.
Romans 8:17
and, if children, heirs also; heirs, indeed, of God, and joint-heirs with Christ; if, indeed, we suffer with Him, that we may be also glorified with Him.

But

Galatians 3:16
Now to Abraham were the promises spoken, and to his Seed. He saith not, "And to seeds," as of many; but as of One, "and to your Seed"; which is Christ.
Luke 1:54
He succored Israel His servant, to remember mercy,
Hebrews 6:12
that ye may not become slothful, but imitators of those who, through faith and long-suffering, inherit the promises.