It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said: “When the slave of anyone of you brings his food to him, for which he (the slave) has worked hard and endured heat, let him invite him to eat with him, and if he does not do that then let him take a morsel and put it in his hand.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عِيسَى بْنُ حَمَّادٍ الْمِصْرِيُّ، أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ جَعْفَرِ بْنِ رَبِيعَةَ، عَنْ عَبْدِ الرَّحْمَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِذَا أَحَدُكُمْ قَرَّبَ إِلَيْهِ مَمْلُوكُهُ طَعَامًا قَدْ كَفَاهُ عَنَاءَهُ وَحَرَّهُ فَلْيَدْعُهُ فَلْيَأْكُلْ مَعَهُ فَإِنْ لَمْ يَفْعَلْ فَلْيَأْخُذْ لُقْمَةً فَلْيَجْعَلْهَا فِي يَدِهِ " .
sunnah.com