“Happy Purim festival” — the greeting exchanged through the day
also written: chag purim sameach, hag purim sameach, chag purim same'ach
In Scripture World English Bible
Therefore the Jews of the villages, who live in the unwalled towns, make the fourteenth day of the month Adar a day of gladness and feasting, a good day, and a day of sending presents of food to one another.
as the days in which the Jews had rest from their enemies, and the month which was turned to them from sorrow to gladness, and from mourning into a good day; that they should make them days of feasting and gladness, and of sending presents of food to one another, and gifts to the needy.
Therefore they called these days “Purim”, from the word “Pur.” Therefore because of all the words of this letter, and of that which they had seen concerning this matter, and that which had come to them,
You shall rejoice in your feast, you, your son, your daughter, your male servant, your female servant, the Levite, the foreigner, the fatherless, and the widow, who are within your gates.