Romans 11:6

but if by grace, no longer by works; for otherwise grace is no longer grace; but if by works, it is no longer grace; for otherwise a work is no longer a work.

Romans 3:27-28

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

Romans 4:4-5

But to one that works the reward is not accounted by grace but by debt.

Romans 5:20-21

For the law supervened that the fall might abound; but where the sin abounded the grace was superabundant,

1 Corinthians 15:10

but by the grace of God I am what I am, and his grace to me was not in vain, but I labored more abundantly than they all, but not I but the grace of God with me.

Galatians 2:21

I do not reject the grace of God; for if rightousness is through the law, then Christ died for nothing.

Galatians 5:4

You have departed from Christ, whoever of you are justified by the law, you have fallen from the grace.

Ephesians 2:4-9

but God who is rich in mercy, on account of his great love with which he loved us,??5 even when we were dead in sins he made us alive with Christ,??y grace are you saved,

2 Timothy 1:9

who saved us, and called us with a holy calling, not according to our works, but according to his purpose and grace given us in Christ Jesus from eternity,

Titus 3:5

not by works of righteousness which we did but according to his mercy he saved us through the washing of regeneration and the 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 the boasting [of the Jew]? It is excluded. By what law? Of works? No; but by the law of faith.
Romans 4:4
But to one that works the reward is not accounted by grace but by debt.
Romans 5:20
For the law supervened that the fall might abound; but where the sin abounded the grace was superabundant,
1 Corinthians 15:10
but by the grace of God I am what I am, and his grace to me was not in vain, but I labored more abundantly than they all, but not I but the grace of God with me.
Galatians 2:21
I do not reject the grace of God; for if rightousness is through the law, then Christ died for nothing.
Galatians 5:4
You have departed from Christ, whoever of you are justified by the law, you have fallen from the grace.
Ephesians 2:4
but God who is rich in mercy, on account of his great love with which he loved us,??5 even when we were dead in sins he made us alive with Christ,??y grace are you saved,
2 Timothy 1:9
who saved us, and called us with a holy calling, not according to our works, but according to his purpose and grace given us in Christ Jesus from eternity,
Titus 3:5
not by works of righteousness which we did but according to his mercy he saved us through the washing of regeneration and the renewing of the Holy Spirit,

General references

Acts 28:24
And some believed the things which were spoken, and others believed not;
Romans 4:4
But to one that works the reward is not accounted by grace but by debt.
Ephesians 2:9
not of works, that no one may boast;