1 Peter 3:20 - 21
ESV - 20 Because they formerly did not obey, when God's patience waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight persons, were brought safely through water. 21 Baptism, which corresponds to this, now saves you, not as a removal of dirt from the body but as an appeal to God for a good conscience, through the resurrection of Jesus Christ.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.