Kommentar zu Bamidbar 29:17

וביום השני פרים שנים עשר, “and on the second day of the Sukkot festival, the mussaph offering is to consist of twelve young bullocks, plus;” just as the fruit which the pilgrims had brought with them to Jerusalem, diminished daily, so did the requirements for the additional number of animals for the communal mussaph offerings. This is a phenomenon that we did not find on the other festivals. If the people had been required to finance the same amount of money for the additional animals required for the mussaph offerings they might have resented this and it would have spoiled the happy atmosphere prevailing.