Acts 18:8

Crispus, the chief ruler of the synagogue. Though the synagogue opposed, its president became a Christian with all his family. Paul baptized him with his own hands (1Co 1:14).

Many of the Corinthians hearing believed, and were baptized. This describes the gospel process of conversion. The word is preached, faith comes by hearing (Ro 10:17), confession (Ro 10:10) and baptism (Ro 6:3,4) follow. This is the invariable order in the New Testament.
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