'One' in the Bible

But one in a certain place testified, saying, What is man, that thou art mindful of him? or the son of man, that thou visitest him?

For both he that sanctifieth and they who are sanctified are all of one: for which cause he is not ashamed to call them brethren,

But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.

For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.

For every one that useth milk is unskilful in the word of righteousness: for he is a babe.

And we desire that every one of you do shew the same diligence to the full assurance of hope unto the end:

But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;

For by one offering he hath perfected for ever them that are sanctified.

And let us consider one another to provoke unto love and to good works:

Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.

Therefore sprang there even of one, and him as good as dead, so many as the stars of the sky in multitude, and as the sand which is by the sea shore innumerable.

Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright.

For here have we no continuing city, but we seek one to come.