The Messenger of Allah (ﷺ) was asked about a man who divorced his wife three times, and she married another who entered upon her, but divorced her before having intercourse with her, whether she was lawful for the former husband. She said: The Prophet (ﷺ) replied: She is not lawful for the first (husband) until she tastes the honey of the other husband and he tastes her honey.
when any of you goes to his bed, he should dust his bedding with the inner extremity of his lower garment, for he does not know what has come on it since he left it. He should then lie down on his right side and say: In Thy name, my mercy on it, but if Thou lettest it go, guard it with that which Thou guardest Thy upright servants.