'One' in the Bible

And now, dear lady, I pray you--writing to you, as I do, not a new command, but the one which we have had from the very beginning--let us love one another.

For many deceivers have gone out into the world--men who do not acknowledge Jesus as Christ who has come in human nature. Such a one is 'the deceiver' and 'the anti-Christ.'

No one has God, who instead of remaining true to the teaching of Christ, presses on in advance: but he who remains true to that teaching has both the Father and the Son.

If any one who comes to you does not bring this teaching, do not receive him under your roof nor bid him Farewell.