15. Why was there a Jesus baptism?

The Saviour evidently ranked baptism as one of the acts inseparable from his Messianic calling (see John 1:31). By being publicly baptized he entered into John's community, which was introductory to his greater Messianic work.

Further, it was the means of revealing himself to the Baptist and through him to the people. John was the forerunner of the Messiah, and it was especially fitting that he should personally serve at Jesus' consecration to his Messianic work, and assist at the beginning of his public career.