In Bulgaria, “Mouse Day” is observed in honour of Saint Nestor to prevent mice from appearing in the home throughout the year. Women observe many prohibitions and rituals on this day. They do not use sharp objects, believing that mice might use their teeth to gnaw clothing and crops. So women do not cut bread with a knife, cut with scissors, chop wood, spin or knit, or even pick up a needle. Sometimes they do no housework at all, believing that mice will eat everything made that day.

To appease the mice, women sometimes bake small rolls and toss them into the attic, cellar, or barn. In some areas, imitative magical acts are performed to seal the mice’s mouths and eyes. These acts are accompanied by a ritual dialogue.

— Gura. *Animal Symbolism in Slavic Folk Tradition*, p. 410