1 John 1:8; 1 John 2:4; 1 John 2:21; 1 John 3:19; 1 John 4:6

1 John 1:8

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

1 John 2:4

4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

1 John 2:21

21 I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.

1 John 3:19

19 And hereby we know that we are of the truth, and shall assure our hearts before him.

1 John 4:6

6 We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.