What do you think of 1 John 5:6 and 1 John 5:8?
This is the one who came by water and blood--Jesus Christ. He did not come by water only, but by water and blood. And it is the Spirit who testifies, because the Spirit is the truth.
the Spirit, the water and the blood; and the three are in agreement.
Jesus came by water and blood.
Many people though just focus on the blood, in light of the scripture did the Spirit not testify to those individuals?
There are some explanations people can refer to.
One is that his crucifixion and we need to get baptized. (though it says "his water" nothing about us)
Another is that it refers to his birth. I believe this is just a explain-away thing like people use with John 3:5.
Lastly I consider it to be johns baptism of christ and his crucifixion.
It also says the water, blood, and spirit are in agreement. In other words, you cant have one without the other.