Targum sobre Rut 3:8

And it happened at midnight that the man shuddered and trembled, and, as a result, his flesh became as soft as a [boiled] turnip. Though he perceived a woman sleeping at his feet, he subdued his evil inclination and did not draw nigh unto her, just like the righteous Joseph, who refused to draw nigh unto the Egyptian woman, the wife of his master; and just like the pious Paltiel, the son of Laish, who placed a sword between himself and Michal, the daughter of Saul and wife of David, refusing to approach her.