'One' in the Bible

If only there was one among you who would see that the doors were shut, so that you might not put a light to the fire on my altar for nothing! I have no pleasure in you, says the Lord of armies, and I will not take an offering from your hands.

Have we not all one father? has not one God made us? why are we, every one of us, acting falsely to his brother, putting shame on the agreement of our fathers?

... So give thought to your spirit, and let no one be false to the wife of his early years.