Heimskringla Death

Óðinn died of sickness in Svíþjóð. And when he was on the point of death
he had himself marked with the point of a spear and claimed as his own all
men who were killed by weapons. He said he was going to go to Goðheimr
and be reunited with his friends there. Now the Svíar believed that he had
gone to the old Ásgarðr and would live there for ever. Then belief in Óðinn
and invocation of him were renewed. The Svíar often thought he appeared to
them before great battles were to take place. Then he gave victory to some of
them, and others he summoned to himself. Both outcomes were considered
good. Óðinn was burned when he was dead, and that burning was carried
out most magnificently. Their belief was that the higher the smoke rose into
the sky, the loftier in heaven would be the one who had been burned, and the
better off the more wealth that was burned with him. Njǫrðr of Nóatun
then became the ruler over the Svíar and maintained the worship. The Svíar
then called him their lord. He received tribute payments from them. In his
day very good peace prevailed and all kinds of such good harvest that the
Svíar believed that Njǫrðr had power over the harvest and the prosperity of
men. In his day most of the gods died and were all burned, and afterwards
worshipped. Njǫrðr died of sickness. He also had himself marked for Óðinn
before he died. The Svíar burned him and wept bitterly over his grave.


- Heimskringla, Ynglinga Saga, Chapter 9