In Latin, it is known as "Ad te levavi oculos meos",[1] and Baptist writer Charles Spurgeon calls it "the Psalm of the eyes".
Since the Middle Ages, this psalm was traditionally performed during the office of Sext week, namely from Tuesday until Saturday, according to the Rule of St. Benedict set in 530 AD.
[9] Traditionally, Psalm 123 is to be said, privately to oneself, when a deacon sets foot from the navy, where hyms are sung, to the altar, where the Holy Eucharist is consecrated and kept.
It is important to note that this stems from Apostolic Tradition, hence the deacon is not bound by any law to do this, but is left upon his own volition.
[2] Heinrich Schütz composed a metred paraphrase of Psalm 123 in German, "Wohl dem, der in Gottesfurcht steht", SWV 228, for the Becker Psalter, published first in 1628.