1 John 1:8; 1 John 2:26; 1 John 3:7

1 John 1:8

8 If we say that we have no sin, we are deceiving ourselves and the truth is not in us.

1 John 2:26

26 These things I have written to you concerning those who are trying to deceive you.

1 John 3:7

7 Little children, make sure no one deceives you; the one who practices righteousness is righteous, just as He is righteous;