“On the eighth day…an assembly” – that is what the verse said: “In return for my love, they hate me; I am prayer” (Psalms 109:4). You find that on the Festival, Israel sacrifices seventy bulls on behalf of the seventy nations. Israel said: ‘Master of the universe, we sacrifice seventy bulls on their behalf, and they should love us; but they hate us, as it is stated: “In return for my love, they hate me.”’
Therefore, the Holy One blessed be He said to them: ‘Now, sacrifice on your own behalf’: “On the eighth day it shall be an assembly for you.” “You shall present a burnt offering, a fire offering, a pleasing aroma to the Lord: One bull, one ram, seven lambs in the first year, unblemished” (Numbers 29:36). “You shall present a burnt offering, a fire offering, a pleasing aroma to the Lord: One bull, one ram” – this is analogous to a king who made a feast for seven days and invited all the people who were in the province during the seven days of the feast.
When the seven days of the feast were over, he said to his close friend: ‘We have satisfied our obligation to all the residents of the province. Let you and I improvise with what you find, a litra of meat, of fish, or vegetable.’ So, the Holy One blessed be He said to Israel: “On the eighth day it shall be an assembly for you” – improvise with what you find, with one bull and one ram.