'One' in the Bible

if any man is blameless, the husband of one wife, having children that believe, who are not accused of riot or unruly.

One of themselves, a prophet of their own, said, Cretans are always liars, evil beasts, idle gluttons.

For we also once were foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, hating one another.

knowing that such a one is perverted, and sinneth, being self-condemned.