Histories (1.44.2-1.46.1)

and in his great and terrible grief at this mischance he called on Zeus by three names—Zeus the Purifier, Zeus of the Hearth, Zeus of Comrades: the first, because he wanted the god to know what evil his guest had done him; the second, because he had received the guest into his house and thus unwittingly entertained the murderer of his son; and the third, because he had found his worst enemy in the man whom he had sent as a protector.

On hearing this, Croesus took pity on Adrastus, though his own sorrow was so great, and said to him, “Friend, I have from you the entire penalty, since you sentence yourself to death. But it is not you that I hold the cause of this evil, except in so far as you were the unwilling doer of it, but one of the gods, the same one who told me long ago what was to be.”

So Croesus buried his own son in such manner as was fitting. But Adrastus, son of Gordias who was son of Midas, this Adrastus, the destroyer of his own brother and of the man who purified him, when the tomb was undisturbed by the presence of men, killed himself there by the sepulcher, seeing clearly now that he was the most heavily afflicted of all whom he knew.