'Righteous One' in the Bible

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?

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."

Now, Abimelech, had not come near unto her, - so he said, O My Lord! a nation even a righteous one, wilt thou slay?