Pausanias;
OROPUS
[I.34.4] The Oropians have near the temple a spring, which they call the Spring of Amphiaraus; they neither sacrifice into it nor are wont to use it for purifications or for lustral water. But when a man has been cured of a disease through a response the custom is to throw silver and coined gold into the spring, for by this way they say that Amphiaraus rose up after he had become a god. Iophon the Cnossian, a guide, produced responses in hexameter verse, saying that Amphiaraus gave them to the Argives who were sent against Thebes. These verses unrestrainedly appealed to popular taste. Except those whom they say Apollo inspired of old none of the seers uttered oracles, but they were good at explaining dreams and interpreting the flights of birds and the entrails of victims1.
References:
- Pausanias, Description of Greece I.34