§ Of the Noldor in Beleriand The Silmarillion

'Yet the shadow of Mandos lies on you also,' said Melian. But Thingol was long silent ere he spoke. 'Go now!' he said. 'For my heart is hot within me. Later you may return, if you will; for I will not shut my doors for ever against you, my kindred, that were ensnared in an evil that you did not aid. With Fingolfin and his people also I will keep friendship, for they have bitterly atoned for such ill as they did. And in our hatred of the Power that wrought all this woe our griefs shall be lost. But hear my words! Never again in my ears shall be heard the tongue of those who slew my kin in Alqualondë! Nor in all my realm shall it be openly spoken, while my power endures. All the Sindar shall hear my command that they shall neither speak with the tongue of the Noldor nor answer to it. And all such as use it shall be held slayers of kin and betrayers of kin unrepentant.'