It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) sent him to Aws bin Hadthan during the days of Tashreeq to announce that no one except a believer will enter Paradise, and the days of Tashreeq are days of eating and drinking.
Hadith Referenceمسند احمد / مسند المكيين / 15793
Hadith Gradingحکم دارالسلام:حديث صحيح، م: 1142. محمد بن سابق مختلف فيه ، وقد توبع