'Fourth' in the Bible

Then it came about on the fourth day that they said to Samson’s wife, “Entice your husband, so that he will tell us the riddle, or we will burn you and your father’s house with fire. Have you invited us to impoverish us? Is this not so?”

Now on the fourth day they got up early in the morning, and he prepared to go; and the girl’s father said to his son-in-law, “Sustain yourself with a piece of bread, and afterward you may go.”