Hammad bin Abi Sulayman (may Allah have mercy on him) reports from Ibrahim (may Allah have mercy on him) concerning a man who says to his wife: "She is divorced after a year." He said: "She is his wife; he may enjoy her for a year."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15091