According to the folk calendar - Ivan the Theologian

For all Orthodox believers, October 9 is a special date, because on this day the church honors the memory of one of the 12 apostles, the only one who died a natural death - John the Theologian. According to folk traditions, sowing of winter crops and all field work were completed on this day. In order to save oneself from dangerous diseases in winter, it was customary to eat a lot of onions and garlic on this day.