Romans 11:6

and if by grace, it is not at all by works: since in that case grace is no more grace.

Romans 3:27-28

Then where is boasting? It is excluded. By what law? of works? No; but by the law of faith.

Romans 4:4-5

But to him that worketh, the reward is not reckoned according to grace, but according to debt;

Romans 5:20-21

But the law came, that the transgression might abound; but where sin did abound, there did grace superabound:

1 Corinthians 15:10

But by the grace of God I am what I am: and his grace was not vain toward me; but I have labored more abundantly than they all: and not I, but the grace of God with me.

Galatians 2:21

I do not make void the grace of God: for if righteousness was through law, then Christ died gratuitiously.

Galatians 5:4

You have been divorced from Christ, whosoever are justified by law: 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

the one having 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 to us in Christ Jesus before the eternal times,

Titus 3:5

not from works which are in righteousness, which we did, but according to his own mercy he saved us, by the washing of regeneration, and the renewal of the Holy Ghost,

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
Then where is boasting? It is excluded. By what law? of works? No; but by the law of faith.
Romans 4:4
But to him that worketh, the reward is not reckoned according to grace, but according to debt;
Romans 5:20
But the law came, that the transgression might abound; but where sin did abound, there did grace superabound:
1 Corinthians 15:10
But by the grace of God I am what I am: and his grace was not vain toward me; but I have labored more abundantly than they all: and not I, but the grace of God with me.
Galatians 2:21
I do not make void the grace of God: for if righteousness was through law, then Christ died gratuitiously.
Galatians 5:4
You have been divorced from Christ, whosoever are justified by law: 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
the one having 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 to us in Christ Jesus before the eternal times,
Titus 3:5
not from works which are in righteousness, which we did, but according to his own mercy he saved us, by the washing of regeneration, and the renewal of the Holy Ghost,

General references

Acts 28:24
And some of them indeed believed the things spoken, but others continued to doubt;
Romans 4:4
But to him that worketh, the reward is not reckoned according to grace, but according to debt;
Ephesians 2:9
not of works, in order that no one may boast: