The mishna states that they bring the ḥaroset to the leader of the seder, although eating ḥaroset is not a mitzva. The Gemara asks: And if it is not a mitzva, for what reason does one bring it to the seder? Rabbi Ami said: It is brought due to the poison in the bitter herbs, which is neutralized by the ḥaroset. In this regard, Rav Asi said: The remedy for one who ate the poison in lettuce is to eat a radish. The remedy for the poison in a radish is leeks. The remedy for the poison in leeks is hot water. A remedy for the poison in all vegetables is hot water. The Gemara comments: In the meantime, while one is waiting for someone to bring him the remedy, let him say the following incantation: Poison, poison, I remember you, and your seven daughters, and your eight daughters-in-law.


haggadah Section: Koreich
Source: https://www.sefaria.org/Pesachim.116a.2?lang=bi