Sufyan (may Allah have mercy on him) mentions it in connected form (mawsul), saying: "What is the condition of men?" And he said: "One of you says: 'I have divorced you, I have taken you back.'" He (peace and blessings be upon him) disliked this excess, or (disliked) pronouncing divorce without regard to its sunnah time.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14899