How did St. John the Baptist’s baptism differ from Jewish baptism for converts?

The baptism performed by St. John the Baptist differed fundamentally from the Jewish rite of baptism for converts, and the latter is not considered the source of John’s practice.1

While ritual immersion in Judaism served as a symbol of purification or consecration—such as in the mikvah or during conversion rituals—John’s baptism was a distinct prophetic act. His rite, which involved immersion in running water, symbolized repentance in preparation for the imminent Final Judgment of God.12

Key distinctions include:
* Purpose: John’s baptism was an act of anticipatory submission to the coming world judgment, rather than an admission rite into a new community or a sacrament conveying forgiveness.1
* Scope: It was addressed to all ranks of Jewish society as a call to produce fruits of repentance, rather than a ritual marking the transition of a Gentile into the Jewish faith.1
* Nature: It was not intended to supersede Judaism or establish a new people, nor did it function as a formal sacrament in the later Christian sense.1