WCF 21.5.
The reading of the Scriptures with godly fear, (Acts 15:21, Rev. 1:3) the sound preaching (2 Tim. 4:2) and conscionable hearing of the Word, in obedience unto God, with understanding, faith and reverence, (James 1:22, Acts 10:33, Matt. 13:19, Heb. 4:2, Isa. 66:2) singing of psalms with grace in the heart; (Col. 3:16, Eph. 5:19, 13, James 5:13) as also, the due administration and worthy receiving of the sacraments instituted by Christ, are all parts of the ordinary religious worship of God: (Matt. 28:19, 1 Cor. 11:23–29, Acts 2:42) beside religious oaths, (Deut. 6:13, Neh. 10:29) vows, (Isa. 19:21, Eccl. 5:4–5) solemn fastings, (Joel 2:12, Esth. 4:16, Matt. 9:15, 1 Cor. 7:5) and thanksgivings upon special occasions, (Ps. 107, Esth. 9:22) which are, in their several times and seasons, to be used in an holy and religious manner. (Heb. 12:28)