Treasury of Scripture Knowledge
Jesus answered him, "Truly, truly, I tell you, a person cannot enter the kingdom of God unless he is born out of water and the Holy Spirit.
So now, what are you waiting for? Get up and be immersed [into Christ], and have your sins washed away as you appeal to His name [i.e., to Christ's authority].'
He saved us, not because of any good deeds we ourselves had done, but because of His mercy. [He saved us] through the washing of new birth [Note: This refers to our immersion in water] and the renewing [work] of the Holy Spirit,
we should draw close [to God] with a sincere heart and a fully assured faith, having had our hearts sprinkled from a guilty conscience [See 9:13-14] and having had our bodies washed with clean water [i.e., in our immersion].
1 Peter 3:21
This water prefigured immersion [into Christ], which now also saves you, not by removing dirt from the [physical] body, but [by serving] as an appeal [or, "pledge"] to God for a clear conscience through the raising of Jesus Christ from the dead.
1 John 5:6
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].
You people are already 'clean' [i.e., have been pruned of undesirable traits] because of [obedience to] the teaching I have given you.