“Hee that beleeueth on the Sonne of God, hath the witnesse in himselfe: he that beleeueth not God, hath made him a liar, because he beleeueth not the record that God gaue of his Sonne.”
1611 King James Version (KJV)
5:10 He that believeth on the Son of God hath the testimony - The dear evidence of this, in himself: he that believeth not God, in this, hath made him a liar; because he supposes that to be false which God has expressly testified.
1Jo 5:10 He that believeth on the Son of God hath the witness in himself. He hath the witness in his changed heart and life. He that believeth not God hath made him a liar. He makes God a liar by rejecting the witness God gives to the Son.