§ Of the Ruin of Doriath The Silmarillion

In those days the Dwarves still came on their journeys into Beleriand from their mansions in Ered Lindon, and passing over Gelion at Sam Athrad, the Ford of Stones, they travelled the ancient road to Doriath; for their skill in the working of metal and stone was very great, and there was much need of their craft in the halls of Menegroth. But they came now no longer in small parties as aforetime, but in great companies well armed for their protection in the perilous lands between Aros and Gelion; and they dwelt in Menegroth at such times in chambers and smithies set apart for them. At that very time great craftsmen of Nogrod were lately come into Doriath; and the King therefore summoning them declared his desire, that if their skill were great enough they should remake the Nauglamír, and in it set the Silmaril. Then the Dwarves looked upon the work of their fathers, and they beheld with wonder the shining jewel of Fëanor; and they were filled with a great lust to possess them, and carry them off to their far homes in the mountains. But they dissembled their mind, and consented to the task.