Bible Verses About Antediluvians: Noah preaches to

For the Messiah himself died for sins, once and for all, a righteous person on behalf of unrighteous people, so that he might bring you to God. He was put to death in the flesh but brought to life by the Spirit;

and in this form he went and made a proclamation to the imprisoned spirits,

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.