Why be Baptised?
a. Because Christ Himself asked to be baptized (Matthew 3:13-15)
"Then Jesus came from Galilee to the Jordan to be baptized by John. But John tried to deter him, saying, "I need to be baptized by you, and do you come to me?" Jesus replied, "Let it be so now; it is proper for us to do this to fulfill all righteousness." Then John consented." (Matthew 3:13-15)
b. Because Christ commanded it
"Then Jesus came to them and said, "All authority in heaven and on earth has been given to me. Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit," (Matthew 28:18-19)