James 4:17
King James VersionSource notes
“Therefore to him that knoweth to do good, and doeth not, to him it is sin.”
Context
14Whereas ye know not what on the morrow. For what your life? It is even a vapour, that appeareth for a little time, and then vanisheth away.
15For that ye to say, If the Lord will, we shall live, and do this, or that.
16But now ye rejoice in your boastings: all such rejoicing is evil.
17Therefore to him that knoweth to do good, and doeth not, to him it is sin.