Romans 11:6

And if the election is by grace, it is no longer by works; otherwise grace is no longer grace.

Romans 3:27-28

Where, then, is boasting? It is excluded. By what law? Of works? No; but by the law of faith.

Romans 4:4-5

Now to him that works, the reward is not counted as a favor, but as a debt:

Romans 5:20-21

But, besides the first offense, law was introduced, in order that offenses might abound: but where sin abounded, grace did much more abound:

1 Corinthians 15:10

But, by the grace of God, I am what I am; and his grace, which was bestowed on me, has not been bestowed in vain: but I have labored more abundantly than they all; not I, how ever, but the grace of God which was with me.

Galatians 2:21

I do not set aside the grace of God: for if righteousness be through law, then Christ has died in vain.

Galatians 5:4

You that are justified by law, have withdrawn from Christ: you have fallen from grace.

Ephesians 2:4-9

but God, being rich in mercy, on account of his great love with which he loved us,

2 Timothy 1:9

who has saved us, and called us with a holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus be fore the times of the ages,

Titus 3:5

not by works of righteousness which we had done, but according to his own mercy, by the washing of regeneration, and renewing of the Holy Spirit,

Treasury of Scripture Knowledge

Summary

And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.

General references

Bible References

And if

Romans 3:27
Where, then, is boasting? It is excluded. By what law? Of works? No; but by the law of faith.
Romans 4:4
Now to him that works, the reward is not counted as a favor, but as a debt:
Romans 5:20
But, besides the first offense, law was introduced, in order that offenses might abound: but where sin abounded, grace did much more abound:
1 Corinthians 15:10
But, by the grace of God, I am what I am; and his grace, which was bestowed on me, has not been bestowed in vain: but I have labored more abundantly than they all; not I, how ever, but the grace of God which was with me.
Galatians 2:21
I do not set aside the grace of God: for if righteousness be through law, then Christ has died in vain.
Galatians 5:4
You that are justified by law, have withdrawn from Christ: you have fallen from grace.
Ephesians 2:4
but God, being rich in mercy, on account of his great love with which he loved us,
2 Timothy 1:9
who has saved us, and called us with a holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus be fore the times of the ages,
Titus 3:5
not by works of righteousness which we had done, but according to his own mercy, by the washing of regeneration, and renewing of the Holy Spirit,

General references

Acts 28:24
And some believed the things that were spoken, and some believed not.
Romans 4:4
Now to him that works, the reward is not counted as a favor, but as a debt:
Ephesians 2:9
not by works, lest any one should boast.