1 Peter 3:19-21

He went in the spiritual realm and made a proclamation to the spirits in prison because of their disobedience of long ago. For during the time of Noah God patiently waited while the ark was being prepared, but only a few were brought safely through the floodwaters: a total of eight souls. This was a prophetic picture of the immersion that now saves you—not a bathing of the physical body but rather the response of a good conscience before God through the resurrection of Jesus Christ