If we say that we have fellowship with Him and yet walk in the darkness [of sin], we lie and do not practice the truth;

And yet I *am* giving you a new command, for such it really is, so far as both He and you are concerned: because the darkness is now passing away and the light, the true light, is already beginning to shine.

Therefore what you heard from the beginning, let it abide in you. If what you heard from the beginning remains in you, you will abide in both the Son and in the Father.

This Jesus is the one whose coming [to earth was introduced] by water [at His immersion. See Matt. 3:13] and [completed] by blood [at His crucifixion, John 19:17-37]. He did not come by the water only, but by the water and by the blood. And it is the Holy Spirit who gives testimony [at both of these events], because the Holy Spirit is [always] the truth. [See John 16:13].