Bible Verses About Antediluvians: Noah preaches to

Because Messiah also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;

in which he also went and preached to the spirits in prison,

who before were disobedient, when God waited patiently in the days of Noah, while the ship was being built. In it, few, that is, eight souls, were saved through water.