HALLEL (hă-lāl, praise). Ps.113.1-Ps.113.9-Ps.118.1-Ps.118.29, which were read on Passover Day, were called the “Egyptian Hallel”; Ps.136.1-Ps.136.26 is an antiphonal psalm of praise and is sometimes called “The Hallel.” Ps.120.1-Ps.120.7-Ps.136.1-Ps.136.26 are often called “The Great Hallel.”
A. Edersheim, The Life and Times of Jesus the Messiah (1886), i 230, ii 159, 533; F. L. Cohen, L. N. Dembitz, “Hallel,” Jew Enc (1901).
International Standard Bible Encyclopedia (1915)
ha-lal’, hal’-el: In the fifth book of the Psalms (107-50) there are several groups of Hallelujah Psalms: 104-106; 111-113; 115-117; 135; 146-150. In the worship of the synagogue Psalms 135-136 and 146-150 were used in the daily morning service. Psalms 113-118 were called the "Egyp Hallel," and were sung at the feasts of the Passover, Pentecost, Tabernacles and Dedication. At the Passover, Psalms 113 and 114 (according to the school of Shammai only Ps 113) were sung before the feast, and Psalms 115-118 after drinking the last cup. The song used by our Lord and the disciples on the night of the betrayal (Mt 26:30), just before the departure for the , probably included Psalms 115-118.