According to both Holy Scripture and the Westminster Standards, rebaptism is a sin. It is a transgression of the Law of God. For the Decalogue commands that God be worshipped only in the authorized way — and not through any ‘graven images’ (such as rebaptism) contrary to His revealed will.
In Old Testament times, bodily circumcision is unrepeatable –and recircumcision was and is impossible. Deut 10:16 & 30:6 and Jeremiah 4:4 & 9:25-26. Because circumcision has now been replaced by baptism, the latter too is unrepeatable — and rebaptism impossible. Romans 4:11-25 & 6:1-5; Galatians 3:6-29; Colossians 2:11-13.
