'Cistern' in the Bible

He said, "Capture them alive!" So they captured them alive and then executed all forty-two of them in the cistern at Beth Eked. He left no survivors.

Hearken not to Hezekiah: for thus saith the king of Assyria, Make an agreement with me by a present, and come out to me, and then eat ye every man of his own vine, and every one of his fig tree, and drink ye every one the waters of his cistern: