Midrash Tanchuma Buber, Pinchas
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ביום השמיני. מה ראה להיות פוחת בכל יום, אלא לימדך התורה דרך ארץ, מן הקרבנות, שאם ילך אדם לאכסניא וקיבלו חבירו, יום ראשון מקבלו ומאכילו עופות, ובשני מאכילו דגים, [בשלישי מאכילו בשר], ברביעי מאכילו ירק, כך פוחת והולך עד שמאכילו קיטנית.
(Numb. 29:35:) ON THE EIGHTH DAY: What was the reason for the number of sacrificial animals being reduced on each day?⁵⁰., Numb. 8:17; Numb. R. 21:25. The Torah is simply teaching you ettiquette from the sacrifices. Thus if someone goes for lodging,⁵¹. where his friend receives him, on the first day that he receives him, he feeds him fowl. Then on the second he feeds him fish; [on the third he feeds him meat;] on the fourth he feeds him greens. So does he continue to reduce, until he is feeding him pulse.
footnotes: ⁵⁰ Tanh ⁵¹ Gk.: Xenia