1 John 5:7-9

Amplified Bible

⁷ For there are three witnesses: ⁸ the Spirit and the water and the blood; and these three are in agreement [their testimony is perfectly consistent]. ⁹ If we accept [as we do] the testimony of men [that is, if we are willing to take the sworn statements of fallible humans as evidence], the testimony of God is greater [far more authoritative]; for this is the testimony of God, that He has testified regarding His Son.