'One' in the Bible

and now I beseech thee, Kyria, not as writing to thee a new command, but which we had from the beginning, that we may love one another,

because many leading astray did enter into the world, who are not confessing Jesus Christ coming in flesh; this one is he who is leading astray, and the antichrist.

every one who is transgressing, and is not remaining in the teaching of the Christ, hath not God; he who is remaining in the teaching of the Christ, this one hath both the Father and the Son;

if any one doth come unto you, and this teaching doth not bear, receive him not into the house, and say not to him, 'Hail!'