'Unto' in the Bible

the Life was manifested, and we have seen and bear witness, and we declare unto you the Life of the Ages which was with the Father and was manifested to us--

If any one sees a brother man committing a sin which is not unto death, he shall ask and God shall give him life--for those who do not sin unto death. There is such a thing as sin unto death; for that I do not bid him make request.

Any kind of wrongdoing is sin; but there is sin which is not unto death.