Hanukkah gelt

 https://en.wikipedia.org/wiki/Hanukkah_gelt

 Rabbi A. P. Bloch has written that

"The tradition of giving money (Chanukah gelt) to children is of long standing. The custom had its origin in the 17th-century practice of Polish Jewry to give money to their small children for distribution to their teachers. In time, as children demanded their due, money was also given to children to keep for themselves. Teenage boys soon came in for their share. According to Magen Avraham (18th century), it was the custom for poor yeshiva students to visit homes of Jewish benefactors who dispensed Chanukah money (Orach Chaim 670). The rabbis approved of the custom of giving money on Chanukah because it publicized the story of the miracle of the oil."^[1]