This podcast deals with the beginning of Bnei Yisrael’s journey through the desert, the miracles that occurred along the way and the mitzvot that were given to them at Marah. Through a discussion of the goals of miracles in general and the purpose of the mitzvot given at this point, we can understand that they are all intended to prepare Bnei Yisrael for their encounter with God at Mt. Sinai.  

Courtesy of www.tanachstudy.com