He narrated that the Messenger of Allah ﷺ sent him and Aws bin al-Hadathan during the days of Tashriq to announce that none shall enter Paradise except a believer, and that the days of Tashriq are days of eating and drinking.
حدثنا محمد بن سابق قال أخبرنا إبراهيم بن طهمان عن أبي الزبير عن ابن كعب بن مالك
أنه حدثه أن رسول الله ﷺ بعثه وأوس بن الحدثان في أيام التشريق فناديا أن لا يدخل الجنة إلا مؤمن وأيام التشريق أيام أكل وشرب
Its isnad is sahih. Muhammad bin Sabiq Tamimi Abu Jafar is trustworthy, and his hadith appears in Sahihayn, and Ibrahim bin Tahman Khurasani is trustworthy, having some rare narrations, though this is not one of them. The hadith has already appeared at 15675.