Ka'b bin Malik (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) sent him and Aws bin al-Hadathan (may Allah be pleased with them both) during the days of Tashriq to announce: "None will enter Paradise except a believer, and the days of Mina are days of eating and drinking."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8251