The rest of this line is "et adorate Dominum in atrio sancto eius" ("and worship the Lord in His holy hall"). The notes to which "adorate" is sung generally descend, as if to illustrate bowing in worship.
Unless stated otherwise, my source for hymn texts and tunes is The Lutheran Service Book.
Monday, December 28, 2020
Saint-Saëns: Christmas Oratorio, Op. 12: X. Chœur
The tenth movement of Saint-Saëns' Christmas Oratorio begins with "Tollite hostias" ("Raise offerings"), and this is demonstrated in the music. In the soprano part, there's an interval of a fourth (D to G) between the notes for "Tollite" and the note for the first syllable of "hostias" (which is also the highest note in the phrase). In the other vocal parts, there are smaller (but still upward) intervals between "Tollite" and "hostias." In the tenor and bass parts, the word "Tollite" itself is sung to an ascending group of notes: