2 Samuel 23:11-15

Now after him was Shammah the son of Agee, a Hararite. And the Philistines were gathered into an army where there was a plot of land full of lentils, and the people fled from the Philistines.

But he took his stand in the midst of the plot, defended it, and struck the Philistines; and the Lord brought about a great victory.

Then three of the thirty chief men went down and came to David at harvest time to the cave of Adullam, while the army of the Philistines was camping in the Valley of Rephaim.

David was then in the stronghold, while the garrison of the Philistines was then in Bethlehem.

And David had a craving and said, “Oh that someone would give me water to drink from the well of Bethlehem which is by the gate!”