WSC Q.6: How many persons are there in the Godhead?
There are three persons in the Godhead; the Father, the Son, and the Holy Ghost; and these three are one God, the same in substance, equal in power and glory. (1 John 5:7, Matt. 28:19)
WLC Q.9: How many persons are there in the Godhead?
There be three persons in the Godhead, the Father, the Son, and the Holy Ghost; and these three are one true, eternal God, the same in substance, equal in power and glory; although distinguished by their personal properties. (1 John 5:7, Matt. 3:16–17, Matt. 28:19, 2 Cor. 13:14, John 10:30)
WCF 2.3.
In the unity of the Godhead there be three persons, of one substance, power, and eternity: God the Father, God the Son, and God the Holy Ghost: (1 John 5:7. Matt 3:16–17, Matt. 28:19, 2 Cor. 13:14) the Father is of none, neither begotten, not proceeding; the Son is eternally begotten of the Father; (John 1:14, 18) the Holy Ghost eternally proceeding from the Father and the Son. (John 15:26, Gal. 4:6)