'Righteous' in the Bible

These are the family records of Noah: Noah was a righteous man. Blameless during his times, Noah communed with God.

Then the LORD told Noah, "Come you and all your household into the ark, because I've seen that you alone are righteous in this generation.

Abraham approached and asked, "Will you actually destroy the righteous along with the wicked?

Perhaps there are 50 righteous ones within the city. Will you actually destroy it and not forgive the place for the sake of the 50 righteous that are found there?

Far be it from you to do such a thing to kill the righteous along with the wicked, so that the righteous and the wicked are treated alike! The Judge of all the earth will do what is right, won't he?"

The LORD said, "If I find 50 righteous people within Sodom, I'll forgive the whole place for their sake."

What if there are five less than 50 righteous ones? Will you bring destruction upon the city because of those five?" The LORD said, "I won't destroy it if I find 45 there."