Gaudete Sunday is the third Sunday of Advent in the liturgical calendar of Western Christianity, including the Roman Catholic Church, the Anglican Communion, Lutheran churches, and other mainline Protestant churches. It can fall on any date from 11 December to 17 December.

Psalm 85 is the 85th psalm of the Book of Psalms, one of a series of psalms attributed to the sons of Korah. In the English of the King James Version, this psalm begins: "LORD, thou hast been favourable unto thy land". In the slightly different numbering system used in the Greek Septuagint and Latin Vulgate translations of the Bible, this psalm is Psalm 84. In Latin, it is known as "Benedixisti Domine terram tuam". In Judaism, it is called "a psalm of returned exiles". The Jerusalem Bible describes it as a "prayer for peace".