The Silmarillion

'Tears unnumbered ye shall shed; and the Valar will fence Valinor against you, and shut you out, so that not even the echo of your lamentation shall pass over the mountains. On the House of Fëanor the wrath of the Valar lieth from the West unto the uttermost East, and upon all that will follow them it shall be laid also. Their Oath shall drive them, and yet betray them, and ever snatch away the very treasures that they have sworn to pursue. To evil end shall all things turn that they begin well; and by treason of kin unto kin, and the fear of treason, shall this come to pass. The Dispossessed shall they be for ever.

'Ye have spilled the blood of your kindred unrighteously and have stained the land of Aman. For blood ye shall render blood, and beyond Aman ye shall dwell in Death's shadow. For though Eru appointed to you to die not in Eä, and no sickness may assail you, yet slain ye may be, and slain ye shall be: by weapon and by torment and by grief; and your houseless spirits shall come then to Mandos. There long shall ye abide and yearn for your bodies, and find little pity though all whom ye have slain should entreat for you. And those that endure in Middle-earth and come not to Mandos shall grow weary of the world as with a great burden, and shall wane, and become as shadows of regret before the younger race that cometh after. The Valar have spoken.'

Then many quailed; but Fëanor hardened his heart and said: 'We have sworn, and not lightly. This oath we will keep. We are threatened with many evils, and treason not least; but one thing is not said: that we shall suffer from cowardice, from cravens or the fear of cravens. Therefore I say that we will go on, and this doom I add: the deeds that we shall do shall be the matter of song until the last days of Arda.'

But in that hour Finarfin forsook the march, and turned back, being filled with grief, and with bitterness against the House of Fëanor, because of his kinship with Olwë of Alqualondë; and many of his people went with him, retracing their steps in sorrow, until they beheld once more the far beam of the Mindon upon Túna still shining in the night, and so came at last to Valinor. There they received the pardon of the Valar, and Finarfin was set to rule the remnant of the Noldor in the Blessed Realm. But his sons were not with him, for they would not forsake the sons of Fingolfin; and all Fingolfin's folk went forward still, feeling the constraint of their kinship and the will of Fëanor, and fearing to face the doom of the Valar, since not all of them had been guiltless of the Kinslaying at Alqualondë. Moreover Fingon and Turgon were bold and fiery of heart, and loath to abandon any task to which they had put their hands until the bitter end, if bitter it must be. So the main host held on, and swiftly the evil that was foretold began its work.

The Noldor came at last far into the north of Arda; and they saw the first teeth of the ice that floated in the sea, and knew that they were drawing nigh to the Helcaraxë. For between the land of Aman that in the north curved eastward, and the east-shores of Endor (which is Middle-earth) that bore westward, there was a narrow strait, through which the chill waters of the Encircling Sea and the waves of Belegaer flowed together, and there were vast fogs and mists of deathly cold, and the sea-streams were filled with clashing hills of ice and the grinding of ice deep-sunken. Such was the Helcaraxë, and there none yet had dared to tread save the Valar only and Ungoliant