§ Of Túrin Turambar The Silmarillion

'Hear the words of the Lord of Waters!' said they to the King. 'Thus he spoke to Círdan the Shipwright: 'The Evil of the North has defiled the springs of Sirion, and my power withdraws from the fingers of the flowing waters. But a worse thing is yet to come forth. Say therefore to the Lord of Nargothrond: Shut the doors of the fortress and go not abroad. Cast the stones of your pride into the loud river, that the creeping evil may not find the gate."'