Literally, hymns of praise. Consists of Psalms 113-118, which were sung by the Levites in the Temple in Jerusalem on Sukkot, Passover, Shavuot, and later Hanukkah. Hallel became part of the synagogue morning service for those days and New Moons. During the chanting of Hallel on Sukkot the lulav, or palm branch, is waved. Some congregations recite Hallel on Passover after the evening service, and it is also part of the Seder, or Passover service. (See also Prayer.)