en_tn_condensed/2pe/02/05.md

and if he did not spare the ancient world

"and if God did not refrain from punishing the people who lived in the ancient world"

but preserved Noah ... along with seven others

"but protected Noah ... along with seven others."

Noah, a herald of righteousness

"Noah, a preacher of righteousness." Possible meanings are 1) Noah taught people that they should live righteous lives, or 2) Noah warned people that the righteous God would judge them.