WSC Q.16: Did all mankind fall in Adam’s first transgression?
The covenant being made with Adam, not only for himself, but for his posterity; all mankind, descending from him by ordinary generation, sinned in him, and fell with him, in his first transgression. (Gen. 2:16–17, Rom. 5:12, 1 Cor. 15:21–22)
WLC Q.22: Did all mankind fall in that first transgression?
The covenant being made with Adam as a public person, not for himself only, but for his posterity, all mankind descending from him by ordinary generation, (Acts 17:26) sinned in him, and fell with him in that first transgression. (Gen. 2:16–17, Rom. 5:12–20, 1 Cor. 15:21–22)
WCF 6.3.
They being the root of all mankind, the guilt of this sin was imputed; (Gen. 1:27–28, Gen. 2:16–17, Acts 17:26, Rom. 5:12, 15–19, 1 Cor. 15:21–22, 45, 49) and the same death in sin, and corrupted nature, conveyed to all their posterity descending from them by ordinary generation. (Ps. 51:5, Gen. 5:3, Job 14:4, Job 15:14)