Comentario sobre Números 29:36

פר אחד איל אחד ONE BULLOCK, ONE RAM — these are an allusion to Israel who form one nation: “Stay with me a little longer”. And this conveys the idea of God’s affection for Israel — just like children who think to take leave of their father to whom he says, “Parting from you is very hard to me; stay one day more”. — A parable! It may be compared to the case of a king who made a banquet etc., as it is related in Treatise Sukkah 55b. And in the Midrash of R. Tanchuma 4:8:17 it states: The Torah teaches you a rule of conduct — that he who has a stranger staying with him should give him on the first day fattened poultry to eat, on the morrow he should give him fish to eat, on the next day animal flesh; on the following day he should give him pulse to eat, and on the next day vegetables, diminishing gradually, just as was the case with the bullocks on the Feast of Tabernacles.

Represent Yisroel. Who are singular on the earth.

פר אחד, איל אחד, “one bullock, one ram. G-d requested the minimum number of sacrifices from the Jewish people on that day, to show that He detained them only because of His fondness of them. (B’chor shor)

Proper conduct… Meaning: It refers to the bulls of the festival above. From their progressive diminishing [in number] we learn proper conduct…