'One' in the Bible

We are bound to give thanks to God always to you, brethren, even as it is meet, for that your faith growth exceedingly, and the love of each one of you all toward one another aboundeth;

For the mystery of lawlessness doth already work: only there is one that restraineth now, until he be taken out of the way.

And then shall be revealed the lawless one, whom the Lord Jesus shall slay with the breath of his mouth, and bring to nought by the manifestation of his coming;

But the Lord is faithful, who shall establish you, and guard you from the evil one .