When your servant brings you your food, if you do not ask him to join you, then (at least) give him a bite or two, or a mouthful or two, for he was in charge of preparing it
Authentic hadithعن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال: «إذا أتى أحدَكم خادمُه بطعامِه، فإنْ لم يُجلِسْه معه، فلْيُناوِلْهُ لُقمةً أو لُقْمَتَيْنِ أو أُكْلَة أو أُكْلَتَين، فإنه وَلِيَ عِلاجَه».
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: “When your servant brings you your food, if you do not ask him to join you, then (at least) give him a bite or two, or a mouthful or two, for he was in charge of preparing it.”
Explanation
This Hadīth encourages good conduct and generosity with slaves and servants who prepare one's food and serve it. The master should feed his servant from that food as he (the servant) made effort to cook and serve that food. It is unfit for a generous and magnanimous person to deprive his servant from the food he has prepared and served; rather, he should give him some of it to satisfy his longing and ward off his possible resentment if he is not given from it.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).