Passage 3.23.9
τὸ δὲ αὐτὸ καὶ ἐν Αἴτνῃ δηλοῦσιν οἱ κρατῆρες· καὶ γὰρ χρυσοῦ ἐς αὐτοὺς καὶ ἀργύρου ποιήματα, ἔτι δὲ καὶ ἱερεῖα τὰ πάντα ἀφιᾶσι· ταῦτα δὲ ἢν μὲν ὑπολαβὸν ἀπενέγκῃ τὸ πῦρ, οἱ δὲ χαίρουσιν ὡς ἐπὶ πεφηνότι ἀγαθῷ, ἀπωσαμένου δὲ τὰ ἐμβληθέντα συμφορὰν ἔσεσθαι τούτῳ τῷ ἀνδρὶ νομίζουσι.
The craters on Etna indicate something similar. For people throw into them crafted objects of gold and silver, and also sacrifices of all sorts. Now if the fire accepts these offerings, carrying them away, they rejoice as though a good omen has appeared; but if the fire rejects what was thrown in, they believe misfortune will befall that person.