The Water baptism washes away your sins. At the same time this baptism in water, gives you a renewal of your mind, and a clean conscience.
We need to have the right humble attitude, mind and spirit in order stand in front of God.
The example is how the priests, the Levites entered the Tabernacle or the Temple (as described in the Old Testament). First they sacrificed an animal (Jesus as the Lamb) and then they were washed with water, before they enter the Holy Place. If they didn’t do this correctly, the Levite would fall down dead.