Apollodorus Library 2.6.2

[2] Not long after, some cattle were stolen from Euboea by Autolycus, and Eurytus supposed that it was done by Hercules; but Iphitus did not believe it and went to Hercules. And meeting him, as he came from Pherae after saving the dead Alcestis for Admetus, he invited him to seek the kine with him. Hercules promised to do so and entertained him; but going mad again he threw him from the walls of Tiryns. ¹ Wishing to be purified of the murder he repaired to Neleus, who was prince of the Pylians. And when Neleus rejected his request on the score of his friendship with Eurytus, he went to Amyclae and was purified by Deiphobus, son of Hippolytus. ² But being afflicted with a dire disease on account of the murder of Iphitus he went to Delphi and inquired how he might be rid of the disease. As the Pythian priestess answered him not by oracles, he was fain to plunder the temple, and, carrying off the tripod, to institute an oracle of his own. But Apollo fought him, ³ and Zeus threw a thunderbolt between them. When they had thus been parted, Hercules received an oracle, which declared that the remedy for his disease was for him to be sold, and to serve for three years, and to pay compensation for the murder to Eurytus.