In one narration the wording is: Sayyiduna Hasan (may Allah be pleased with him) and Sayyiduna Husayn (may Allah be pleased with him) said: "By Allah! And again by Allah! Allah Almighty has cursed you." The rest of the narration is as before.
Abu Ya'la recorded it, and the wording is his; its chain contains a narrator, Ata bin al-Sa'ib, whose memory had deteriorated.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الخلافة / 9229