Al HaNissim alternatively V'al HaNissim is an addition to the Amidah and Birkat Hamazon on Hanukkah and Purim. On both holidays, it starts off with a short paragraph, beginning with the words for which it is named. After that, each holiday has a unique paragraph, describing the events for which that day is celebrated.

Mattathias ben Johanan was a Kohen who helped spark the Maccabean Revolt against the Hellenistic Seleucid Empire. Mattathias's story is related in the deuterocanonical book of 1 Maccabees and in the writings of Josephus. Mattathias is accorded a central role in the story of Hanukkah and, as a result, is named in the Al HaNissim prayer Jews add to the Birkat Hamazon and the Amidah during the festival's eight days.