Guided by Holy Spirit

Who does overcome the world if not the person who believes that Yeshua, Jesus is the Son of one God ?

He is the one who came by means of water and blood, Yeshua, JESUS the Messiah — not with water only, but with the water and the blood. And the Spirit bears witness, because the Spirit is the truth. 

There are three witnesses  

the Spirit, the water and the blood 

 and these three are in agreement.

1 John 5:5-8