Alleluia

Alleluia (Hallelujah) is a Hebrew imperative meaning "praise the Lord," which entered Christian worship as a word of joy carried over untranslated from the Hebrew Psalms, where it opens and closes a number of the songs of praise. In Christian usage it became an exclamation of praise in its own right, sung especially in the Easter season and attached to the reading of the Gospel and to psalmody, and the Book of Revelation places it in the mouths of the heavenly host. Its untranslated survival, like the Amen and the Hosanna, links Christian worship directly to its Hebrew and synagogue roots, the church continuing to praise God in the very word of the psalmist. In the Western tradition the Alleluia is notably suppressed during the penitential season of Lent and restored with emphasis at Easter, so that its absence and return themselves mark the rhythm of the liturgical year.

The Hallel psalms, Psalms 113 to 118, are the primary biblical source of Hebrew hallelujah, sung at festivals in Jewish liturgy, and it is this psalmic collection that early Christian communities inherited directly when the word passed untranslated into Greek and then Latin. Its jubilus, the extended melisma stretching the final vowel of the sung Alleluia in Gregorian chant, became a specific subject of medieval music theory and is credited by some liturgical historians as a spur to the later development of sequence hymns, composed texts fitted to an existing melisma's notes so the wordless elaboration could carry sung words. Its total suppression through Lent and dramatic return at the Easter Vigil makes its absence and reappearance one of the most structurally deliberate uses of a single word in Christian practice.

Within the Hebrew Bible, halelu yah functions as a structural marker rather than free composition: it opens and closes specific psalms in the two blocks that use it, 113 through 118, known collectively as the Hallel and recited at Passover and other festivals, and 146 through 150, the closing sequence of the entire Psalter, so its appearances are concentrated and formulaic rather than scattered evenly through the biblical poetry. Its single New Testament occurrence, in Revelation 19, places it in a heavenly liturgical scene of praise, and it is this Greek transliteration in Revelation, alleluia rather than a translated phrase, that fixed the word's exact form for the Christian liturgical tradition that followed, rather than any direct continuous borrowing from synagogue practice.

One of the more distinctive things later Christian liturgy did with the word, unrelated to anything in its biblical use, is suppress it seasonally: the Western church developed a practice, well established by the early medieval period, of omitting Alleluia entirely during Lent, so that its return at the Easter vigil functions as a marked liturgical event, the reintroduction of a word deliberately withheld for weeks precisely so its reappearance can be felt rather than simply heard. Eastern liturgical practice treats the word differently again, retaining it through Lent in a more subdued musical setting rather than removing it outright, so the two halves of Christianity that inherited the same Hebrew word built two different seasonal disciplines of withholding and restoring it, neither of which has anything to do with the term's original festival use in the Hallel psalms.