1 John 5:16 in 8 translations

If any man see his brother sin a sin not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it.

1611 / 1769 · Public domain · The Authorised Version, revised to the 1769 Blayney text. Includes the Apocrypha as printed in 1611.

If any man see his brother sinning a sin not unto death, he shall ask, and [God] will give him life for them that sin not unto death. There is a sin unto death: not concerning this do I say that he should make request.

1901 · Public domain · The American revision of the English Revised Version. Deliberately literal, and the base text behind several later translations.

If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.

1890 · Public domain · John Nelson Darby's translation, made for close study rather than public reading. Often exposes grammatical detail other versions smooth over.

If any one may see his brother sinning a sin not unto death, he shall ask, and He shall give to him life to those sinning not unto death; there is sin to death, not concerning it do I speak that he may beseech;

1898 · Public domain · The most extreme word-for-word rendering here, keeping Hebrew and Greek tense and word order at the cost of natural English.

If anyone sees his brother sinning a sin not leading to death, he shall ask, and God will give him life for those who sin not leading to death. There is a sin leading to death. I don’t say that he should make a request concerning this.

2000s · Public domain · A modern-English update of the ASV. Reads close to contemporary speech while staying in the literal tradition. Includes the Apocrypha.

If anyone sees one of our people committing some sin that is not a sin leading to death, they should ask, and God will give them life. I refer to those whose sin does not lead to death. There is a sin that leads to death. I am not saying that you should pray about that.

in progress · Public domain (CC0) · A modern open-licensed translation, still being completed. Some Old Testament books are not yet available.

If a man sees his brother doing a sin which is not bad enough for death, let him make a prayer to God, and God will give life to him whose sin was not bad enough for death. There is a sin whose punishment is death: I do not say that he may make such a request then.

1949 · Public domain · Written with roughly a thousand basic English words plus a small Bible vocabulary. The plainest reading available here.