Rebbe refuses new car:
Rebbe pays for Megillah:
 Admur Hilchos Mechira 9 [same exact wording as Michaber brought next]; Michaber C.M. 249/5; Kiddushin 59a regarding story with Rav Gidal who refused to receive a present of property from Rav Aba.
 The reason: As the verse [Mishlei 15/27] states “Hasoneh Matanos Yichyeh.” [Admur and Michaber ibid] One who accepts presents can lead him to chase after money and steal or become dishonest. Avoiding presents emphasizes one’s integrity. [Mefarshim on Mishlei ibid] Likewise, people are usually in search for money to feed themselves and their families, and on this the verse teaches that on the contrary, one who does not accept presents lives. The reason for this is because one who accepts presents is now “bribed” against chastising the giver for wrongdoing and he gets into the habit of flattering people. [Smeh 249/4]
 See Hiskashrus 1025