It is narrated from Laith (ibn Abi Sulaym) that Imam Tawus, may Allah have mercy on him, said: Sometimes Sayyiduna Ibn Abbas, may Allah be pleased with them both, formed an opinion and then abandoned it.
Hadith Referenceسنن دارمي / مقدمه / 652
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده ضعيف لضعف الليث وهو ابن أبي سليم، [مكتبه الشامله نمبر: 654]