Lectionary Preaching Workbook
Historically, most of the liturgical churches celebrate the First Sunday in Lent as Invocabit, as the ancient introit announces: "He shall call upon me, and I will answer him. I will deliver him and honor him. With long life will I satisfy him and show him my salvation. He that dwelleth in the secret place of the most High shall abide under the shadow of the Almighty." The classic introit rearranges the verses of Psalm 91, that are used by beginning with verses 15 and 16 in the antiphon, with verse 1 as the liturgical remnant in the psalm verse.