Aban bin Uthman (may Allah have mercy on him) says that a man gave his authority to his wife, and she gave three divorces. The matter was brought to Zayd bin Thabit (may Allah be pleased with him), and he said: It is one divorce, and the man has more right to the woman.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15040