Sahih Muslim Book 8, Hadith Number 3357.

Chapter: It is not permissible to marry a woman, who is divorced by three pronouncements until she is married to another, man and he has a sexual intercourse with her, and then he abandons her and she completes her ‘Idda.

‘Aisha (Allah be pleased with her) reported that Allah’s Messenger (May peace be upon him) was asked about a woman whom a man married and then divorced her, and then she married (another) person, and she was divorced before sexual intercourse with her, whether it was lawful for her first husband (to marry her in this state). He (the Holy Prophet) said: No, until he has tasted her sweetness.