'Lie' in the Bible

If we say that we have fellowship with him and walk in the darkness, we lie, and do not the truth:

I have not written unto you because ye know not the truth, but because ye know it, and because no lie is of the truth.

And as for you, the anointing which ye received of him abideth in you, and ye need not that any one teach you; but as his anointing teacheth you; concerning all things, and is true, and is no lie, and even as it taught you, ye abide in him.