Passage 9.18.2
τούτου δὲ ἐγγύτατα τρεῖς εἰσιν ἀργοὶ λίθοι· Θηβαίων δὲ οἱ τὰ ἀρχαῖα μνημονεύοντες Τυδέα φασὶν εἶναι τὸν ἐνταῦθα κείμενον, ταφῆναι δὲ αὐτὸν ὑπὸ Μαίονος, καὶ ἐς μαρτυρίαν τοῦ λόγου παρέσχον τῶν ἐν Ἰλιάδι ἔπος Τυδέος, ὃν Θήβῃσι χυτὴ κατὰ γαῖα καλύπτει. Hom. Il. 14.114
Very near this place there are three unworked stones. Those among the Thebans who preserve ancient memories say that the one lying here is Tydeus, and that he was buried by Maion; as proof of this story they cite the line from the Iliad concerning Tydeus: "whom the heaped earth covers in Thebes."