مسند اسحاق بن راهويه
Musnad Ishaq Bin Rahwiya
كتاب النكاح و الطلاق
Book of Marriage and Divorce
Giving three divorces at once explained
Hadith Number: 645
قال الحسن: فذکرت ذٰلك لطاؤوس، فقال: اشهد انی سمعت ابن عباس یجعلها واحدة، قال: وقال عمر: واحدة، وان جمعهن.
Hasan (may Allah have mercy on him) narrated: I mentioned this to Tawus (may Allah have mercy on him), so he said: I testify that I heard Sayyiduna Ibn Abbas (may Allah be pleased with them both) considering them as one. The narrator stated, and Sayyiduna Umar (may Allah be pleased with him) said: It is only one, even if he combined them.
تخریج الحدیث: «انظر ما قبله .»