It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When the servant of any one of you endures the heat and smoke of your food, then make him sit with you and feed him. If he refuses, then take a morsel, affect it, and then give it to him to eat."
Hadith Referenceالسنن المأثورة / باب إطعام الخادم مما يأكل منه مالكه / 518
Hadith Takhrijصحیح بخاری، الأطعمة، باب الأكل مع الخادم، رقم: 5460، صحیح مسلم، الایمان، باب اطعام المملوك مما يأكل ...... الخ، رقم: 1663