Occurs in the Bible only in Rev. 1: 10. The first day of the week is meant, being the day of our Lord’s resurrection and also the day on which the Holy Spirit came upon the apostles. References to its weekly observance are found in 1 Cor. 16: 1-2; Acts 20: 7; and in many early Christian writers. It was never confounded with the Sabbath, but carefully distinguished from it (e.g., Col. 2: 16). The term is used also in D&C 59: 9-13.