Musnad Ahmad 27:328

Waki’ narrated to us, Sufyan narrated to us, from ‘Alqamah ibn Marthad, from Razin ibn Sulayman al-Ahmari, from Ibn ‘Umar, who said: The Prophet, peace and blessings of Allah be upon him, was asked about a man who divorces his wife three times, then another man marries her, closes the door, and lowers the curtain, then divorces her before he has had intercourse with her. Is she lawful for the first [husband]? He said: "No, until he tastes her sweetness."