From Sahih Muslim (Hadith 3531):
A'Asha (Allah be pleased with her) reported:A person divorced his wife by three pronouncements; then another person married her and he also divorced her without having sexual intercourse with her. Then the first husband of her intended to remarry her. It was about such a case that Allah's Messenger (ﷺ) was asked, whereupon he said: No, until the second one has tasted her sweetness as the first one had tasted
Reference: Muslim 3531