sacred

Definition:

Term "sacred" describes something that relates to worshiping God or to the pagan worship of false gods.

In the Old Testament, often the term "sacred" is used to describe the stone pillars and other objects used in the worship of false gods. This could also be translated as "religious."
"Sacred songs" or "sacred music" refer to music that is sung or played for God's glory. This could be translated as "music for worshiping Yahweh" or "songs that praise God."
The phrase "sacred duties" refers to the "religious duties" or "rituals" that a priest performs to lead people in worshiping God. It could also refer to the rituals performed by a pagan priest to worship a false god.