Saruman couldn't stay in Middle-earth, he was killed by Grima. Since he was incarnate as a Man, he would have to depart from the world. Gandalf seems to have done this when the Balrog killed him, but Eru sent him back to destroy Sauron.
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Then Felagund upon the head
of Arothir set it: "Nephew mine,
till I return this crown is thine."
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