It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The days of Tashreeq are days of eating, drinking, and remembering Allah." In another chain of narration, only eating and drinking are mentioned.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7134
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد حسن