Israel faces another test in this section of Exodus. The key to understanding this passage is found in verse 25 – "and there he proved them". One of the major purposes of God in the wilderness journeyings was to test His people. So, there is much to be learned about trials and testings in the walk of faith from this passage. The word 'Marah' means "bitterness" so we can also learn something about bitter experiences in the Christian life and how to overcome them by God's grace.