Muhammad bin Iyas bin al-Bukayr says: A man gave his wife three divorces before consummating the marriage. Later he decided to marry the same woman, so he came to ask for a fatwa. I went with him to ask about the matter for him, and he asked Abu Hurayrah (may Allah be pleased with him) and Abdullah bin Abbas (may Allah be pleased with them both) about it. Both of them said: "Do not marry this woman until she marries another man." He said: My divorce of her was only one. Ibn Abbas (may Allah be pleased with them both) said: "You have let go from your hand the extra that you had."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14965