God did not spare the ancient world, but brought the flood on the world of godless people; the only ones he saved were Noah, who preached righteousness, and seven other people.
It was faith that made Noah hear God's warnings about things in the future that he could not see. He obeyed God and built a boat in which he and his family were saved. As a result, the world was condemned, and Noah received from God the righteousness that comes by faith.
Instead, you laughed and celebrated. You killed sheep and cattle to eat, and you drank wine. You said, “We might as well eat and drink! Tomorrow we'll be dead.”
“Suppose one of you has a servant who is plowing or looking after the sheep. When he comes in from the field, do you tell him to hurry along and eat his meal?