The Lord told Noah, “Go into the ark with all your family. I have seen how you are a man of integrity, living a moral life among the people of this generation.
It will be as in the days before the flood, when they were eating and drinking, marrying and giving in marriage, right up until the day that Noah went into the ark.
Noah trusted God, and was warned by him about things that had never happened before. Because Noah paid serious attention to what God said, he constructed an ark to save his family. By trusting God, Noah showed that the world was wrong, and received the reward of being set right by God.
So by these two actions that can't be changed, and since it's impossible for God to lie, we can have total confidence, having run for safety to take hold of the hope God presented to us.
that refused to believe, when God patiently waited in the time of Noah while the ark was being built. Only a few—in fact eight people—were saved “through water.”
God didn't spare the ancient world either, but he protected Noah who told people about the God who did right. He was one of the eight who were saved when God sent a flood upon a world of evil people.