1 Peter 3:20-21

to those who were disobedient long ago, in the days of Noach, when God waited patiently during the building of the ark, in which a few people — to be specific, eight — were delivered by means of water.

This also prefigures what delivers us now, the water of immersion, which is not the removal of dirt from the body, but one’s pledge to keep a good conscience toward God, through the resurrection of Yeshua the Messiah.