'Descendants' in the Bible

the Jews bound themselves, their descendants, and all who joined with them to a commitment that they would not fail to celebrate these two days each and every year according to the written instructions and according to the time appointed.

These days are remembered and celebrated by every generation, family, province, and city, so that these days of Purim will not lose their significance in Jewish life and their memory will not fade from their descendants.

in order to confirm these days of Purim at their proper time just as Mordecai the Jew and Queen Esther had established them and just as they had committed themselves and their descendants to the practices of fasting and lamentation.