John opens by saying if any man see his brother sin a sin not unto death he shall ask and he shall give them life for them that sin not unto death. Any sin that is not unto death is a sin that is repented of! A sin unto death would be a willful, continuous unrepentant sin! Ananias and Sapphira would be two examples of a sin unto death of two believers! John concludes not to pray for the unrepentant sinner because they have had many opportunities to repent but continue to willfully live in their sin. Thankyou. James and Hamsa Sasse. GodWhoisGod.com