Rom 3:10-12, Mk 10:18, Rom 3:4

In the Old Testament, David confessed that everyone was a sinner. (Psalms 53:2-3)

Psalms 53:2 God looked down from heaven upon the children of men, to see if there were any that did understand, that did seek God. 3 Every one of them is gone back: they are altogether become filthy; there is none that doeth good, no, not one.

Paul quoted the Old Testament and confessed that there is no one righteous in the world. (Romans 3:10-12)

Romans 3:10 As it is written, There is none righteous, no, not one: 11 There is none that understandeth, there is none that seeketh after God. 12 They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one.

There is only one righteous person in the world, Christ Jesus, who came to this earth. (Mark 10:18)

Mark 10:18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.

Also, only God is true. (Romans 3:4)

Romans 3:4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.