'Waters' in the Bible

Then Joab sent messengers to David and said, "We have fought against Rabbah, and we captured the city of the waters.

For {we must certainly die}, and [we are] as the waters spilled to the ground which cannot be gathered. God will not take a life but devises plans for a banished person not to be cast out from him.

He sent from a high position [and] took me; he drew me from mighty waters.