The Fall of Gondolin

by J.R.R. Tolkien

They [the departing Noldoli] came to a place where a high rock stands above the shores, and there stood either Mandos or his messenger and spoke the Doom of Mandos. For the kin-slaying he cursed the house of Fëanor, and to a less degree all who followed them, or shared in their emprise, unless they would return to abide the doom and pardon of the Valar. But if they would not, then should evil fortune and disaster befall them, and ever from treachery of kin towards kin; and their oath should turn against them; and a measure of mortality should visit them, that they should be lightly slain with weapons, or torments, or sorrow, and in the end fade and wane before the younger race. And much else he foretold darkly that after befell, warning them that the Valar would fence Valinor against their return.