It is narrated from Abu Huraira (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 protects him from the heat and smoke of cooking, then at the time of eating, he should make him sit with him. If this is not possible, then he should give him a tasty morsel from that food, or grant it to him." Or he said a word of similar meaning (the narrator is in doubt).
Hadith Referenceمسند الإمام الشافعي / كتاب العتق والولاء والمدبر والمكاتب وحسن الملكة / 1102
Hadith Takhrijاخرجه البخاري، الأطعمة، باب الأكل مع الخادم (5460) ، (2557) ومسلم، الایمان، باب اطعام، المملوك مما يأكل ...... الخ (1663)۔