Galatians 3:18

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

Luke 1:54-55

He hath supported Israel his servant,

Luke 1:72-73

to display his mercy towards our fathers, and to remember his holy covenant,

Romans 4:13-16

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

Romans 8:17

And if children, then heirs; heirs of God, and co-heirs with Christ: if so be we suffer with Him, that we may be also glorified with Him.

Galatians 2:21

I do not frustate the grace of God: for if righteousness be by the law, then Christ died in vain.

Galatians 3:10

For as many as are of the works of the law, are under the curse; for it is written, Cursed be every one that continueth not in all things which are written in the book of the law, to do them.

Galatians 3:12

now the law is not of faith, but saith, "The man that doth them, shall live in them."

Galatians 3:16

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

Galatians 3:26

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

Galatians 3:29

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

Hebrews 6:12-15

that ye would not be sluggish, but imitators of them who through faith and patience are inheriting 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 the works of the law, are under the curse; for it is written, Cursed be every one that continueth not in all things which are written in the book of the law, to do them.
Galatians 2:21
I do not frustate the grace of God: for if righteousness be by the law, then Christ died in vain.
Romans 4:13
For the promise made to Abraham, or to his seed, that he should be heir of the world, was not by the law, but by the righteousness of faith:
Romans 8:17
And if children, then heirs; heirs of God, and co-heirs with Christ: if so be we suffer with Him, that we may be also glorified with Him.

But

Galatians 3:16
Now the promises were made to Abraham, and to his seed. He doth not say, "and to seeds," as of many; but as of one, "and to thy seed," which is Christ.
Luke 1:54
He hath supported Israel his servant,
Hebrews 6:12
that ye would not be sluggish, but imitators of them who through faith and patience are inheriting the promises.