Final answer:
The Sacrament of Baptism was initiated by Jesus during his own baptism in the Jordan River by John the Baptist. This event marked the beginning of Jesus' public ministry and is significant in Christian theology.
Step-by-step explanation:
The Sacrament of Baptism was initiated by Jesus during his own baptism in the Jordan River by John the Baptist. This event is described in the gospels of Matthew, Mark, and Luke. Jesus' baptism marked the beginning of his public ministry and is considered an important moment in Christian theology.