Acts 11:16 Then I remembered what the Lord had said: ‘John baptized with water, but you will be baptized with the Holy Spirit.’
The disciple remembered Jesus’ words when he saw the people being filled with the Holy Spirit.
God was allowing these people to be submerged in the Holy Spirit and raised up into a new life with Him.
John baptised people by dunking them in water as a sign they were being buried from their old lives and raised into a new life with Christ.
Accepting Christ as Lord and Saviour can be taken personally in many ways; but all show a willingness to leave the old behind and live with the new!