I haven't drawn this, yet?! Wow. Well, baptism is the first ordinance in the Gospel. It is a very symbolic ordinance in which our sins are washed away as we covenant to obey the God's commandments. We also covenant to stand as witnesses in all times and places, to mourn with those who mourn, comfort those in need of comfort.
The full scripture (Mosiah 18:8-10) explains it better than I, for my summing up would be a shoddy paraphrase: