WCF 15.3.
Although repentance be not to be rested in, as any satisfaction for sin, or any cause of the pardon thereof, (Ezek. 36:31–32, Ezek. 16:61–63) which is the act of God’s free grace in Christ; (Hos. 14:2, 4, Rom. 3:24, Eph. 1:7) yet it is of such necessity to all sinners, that none may expect pardon without it. (Luke 13:3, 5, Acts 17:30–31)