Galatians 3:18

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

Luke 1:54-55

He hath helped his servant Israel,

Luke 1:72-73

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

Romans 4:13-16

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

Romans 8:17

And if children, then heirs, heirs of God, and joint-heirs with Christ: if we suffer with him, that we may also be glorified with him.

Galatians 2:21

I do not make void the grace of God; for if righteousness is by the law, then Christ died in vain.

Galatians 3:10

for it is written, Cursed is every one who continueth not in all the things which are written in the book of the law, to do them.

Galatians 3:12

Now the law is not of faith; but the man that doeth them, shall live by them.

Galatians 3:16

Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.

Galatians 3:26

For ye are all sons of God by faith in Jesus Christ.

Galatians 3:29

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

Hebrews 6:12-15

That ye be not slothful, but followers of them, who through faith and long suffering inherited 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 it is written, Cursed is every one who continueth not in all the things which are written in the book of the law, to do them.
Galatians 2:21
I do not make void the grace of God; for if righteousness is by the law, then Christ died in vain.
Romans 4:13
For the promise, that he should be the heir of the world, was not to Abraham or to his seed by the law, but by the righteousness of faith.
Romans 8:17
And if children, then heirs, heirs of God, and joint-heirs with Christ: if we suffer with him, that we may also be glorified with him.

But

Galatians 3:16
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Luke 1:54
He hath helped his servant Israel,
Hebrews 6:12
That ye be not slothful, but followers of them, who through faith and long suffering inherited the promises.