James 4:17

Therefore to him that knoweth to do good, and doeth it not, to him it is sin.

John 9:41

Jesus said to them, If ye were blind, ye would have no sin: but now ye say, We see; therefore your sin remaineth.

Luke 12:47-48

And that servant who knew his lord's will, and prepared not himself, neither did according to his will, shall be beaten with many stripes.

John 13:17

If ye know these things, happy are ye if ye do them.

John 15:22

If I had not come and spoken to them, they had not had sin: but now they have no cloke for their sin.

Romans 1:20-21

For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:

Romans 1:32

Who, knowing the judgment of God, that they who commit such things are worthy of death; not only do the same, but have pleasure in them that do them.

Romans 2:17-23

Behold, thou art called a Jew, and restest in the law, and makest thy boast of God,

Romans 7:13

Was then that which is good made death to me? By no means. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.

2 Peter 2:21

For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered to them.

Treasury of Scripture Knowledge

Summary

Therefore to him that knoweth to do good, and doeth it not, to him it is sin.

Bible References

General references

Luke 12:47
And that servant who knew his lord's will, and prepared not himself, neither did according to his will, shall be beaten with many stripes.
John 9:41
Jesus said to them, If ye were blind, ye would have no sin: but now ye say, We see; therefore your sin remaineth.
John 13:17
If ye know these things, happy are ye if ye do them.
John 15:22
If I had not come and spoken to them, they had not had sin: but now they have no cloke for their sin.
Romans 1:20
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
Romans 2:17
Behold, thou art called a Jew, and restest in the law, and makest thy boast of God,
Romans 7:13
Was then that which is good made death to me? By no means. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.