Ephesians 5:26
so that He could dedicate her [to Himself], after cleansing her by means of the washing of water [i.e., immersion], accompanied by the word. [Note: "The word" here refers either to a person's profession of faith (See Rom. 10:9) or to the Gospel message (See Rom. 10:17), both of which are associated with immersion].
Hebrews 10:1-2
For the law of Moses was [only] a foreshadow of the good things that [were] to come [i.e., in the Messianic age], not the exact image of those things. It can never, by the same sacrifices, continually offered year after year, make [morally] perfect those who draw near [to God in worship].
Titus 2:14
He gave Himself up for us, to buy us back from [enslavement to] all [kinds of] wickedness and to purify for Himself a group of people who belong to Him and who are eager to do good deeds.
Hebrews 9:13-14
For if the blood of goats and bulls, and a [burnt] heifer's ashes sprinkled on people who had been [ceremonially] defiled, could purify them so as to make them [ceremonially] clean on the outside,
1 John 1:7-9
But, if we live in the light [of righteousness] just like God [constantly] lives in the light [of righteousness], we can truly share a relationship with one another and [can know that] the blood of Jesus, God's Son, continues to cleanse [our spirits] from all of our sins.