Saeed bin Jubair (may Allah have mercy on him) said in the explanation of ﴿مِنْأَوْسَطِمَاتُطْعِمُونَأَهْلِيكُمْ﴾: The food for the elder used to be better than that for the younger, and for the free person better than for the slave, so Allah the Exalted commanded the middle standard, which is neither the highest nor the lowest.
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 798
Hadith Gradingمحدثین:سنده ضعيف لإرساله، وهو صحيح إلى مرسله سعيد بن جبير.