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Psalm 138 is the 138th psalm from the Book of Psalms, which is the first book of the Ketuvim ("Writings") in the Hebrew Bible, and is also a book of the Christian Old Testament. This particular psalm describes that those who are close to God live in reality, and those who believe in human power live in a world of fantasy. It is attributed to King David.
Catholic
Historically, this psalm was recited or sung at the office of Vespers on Wednesday, according to the Rule of St. Benedict. In the Liturgy of Hours, Psalm 138 is recited at Vespers of Tuesday of the fourth semaine. Moreover, in the liturgy of the Mass, it is played on the 21st Sunday of Ordinary Time of the year, the 5th and the 17th Sunday in Ordinary Time of the year.
References
Psalm 138 Wikipedia(Text) CC BY-SA