WCF 5.2.
Although, in relation to the foreknowledge and decree of God, the first Cause, all things come to pass immutably, and infallibly; (Acts 2:23) yet, by the same providence, He ordereth them to fall out, according to the nature of second causes, either necessarily, freely, or contingently. (Gen. 8:22, Jer. 31:35, Exod. 21:13, Deut. 19:5, I Kings 22:28, 34, Isa. 10:6–7)