He praised Ruth’s deed and, moreover, he did not betray temperance, but he kept to the law of nuptial congress. “You show by your deed,” he said, “that this was not done out of voluptuousness. In fact, you might have gone to those who are young and blooming, with only the intent of enjoying voluptuousness, but you went to the man who stands in place of a father to you.” Twice indeed, he calls her daughter.
Source: QUESTIONS ON RUTH