James 4:17

Therefore to him that knows to do good, and does it not, to him it is sin.

John 9:41

Jesus said unto them, If you were blind, you should have no sin: but now you say, We see; therefore your sin remains.

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 you know these things, happy are you if you do them.

John 15:22

If I had not come and spoken unto them, they would not have sin: but now they have no cover 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 deity; 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, you are called a Jew, and rest in the law, and make your boast of God,

Romans 7:13

Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceedingly 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 unto 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 unto them, If you were blind, you should have no sin: but now you say, We see; therefore your sin remains.
John 13:17
If you know these things, happy are you if you do them.
John 15:22
If I had not come and spoken unto them, they would not have sin: but now they have no cover 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 deity; so that they are without excuse:
Romans 2:17
Behold, you are called a Jew, and rest in the law, and make your boast of God,
Romans 7:13
Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceedingly sinful.