'One' in the Bible

And now I ask you, lady (not as [if I were] writing a new commandment to you, but [one] that we have had from the beginning), that we should love one another.

Everyone who goes too far and does not remain in the teaching of Christ does not have God. The one who remains in the teaching--this person has both the Father and the Son.

because the one who speaks a greeting to him shares in his evil deeds.