Jeremiah 2:13: God's people forsook the fountain of living water and dug what?

Answer: Broken cisterns

They committed two evils: forsaking God, the fountain of living water, and digging "broken cisterns that cannot hold water."

““For My people have committed two evils: They have forsaken Me, the fountain of living water, and they have dug their own cisterns—broken cisterns that cannot hold water.”— Jeremiah 2:13 (BSB)