Passage 9.11.2
τοῦτο μὲν ἐνταῦθα οἱ Θηβαῖοι γραφῆναι λέγουσιν· ἐπιδεικνύουσι δὲ Ἡρακλέους τῶν παίδων τῶν ἐκ Μεγάρας μνῆμα, οὐδέν τι ἀλλοίως τὰ ἐς τὸν θάνατον λέγοντες ἢ Στησίχορος ὁ Ἱμεραῖος καὶ Πανύασσις ἐν τοῖς ἔπεσιν ἐποίησαν. Θηβαῖοι δὲ καὶ τάδε ἐπιλέγουσιν, ὡς Ἡρακλῆς ὑπὸ τῆς μανίας καὶ Ἀμφιτρύωνα ἔμελλεν ἀποκτιννύναι, πρότερον δὲ ἄρα ὕπνος ἐπέλαβεν αὐτὸν ὑπὸ τοῦ λίθου τῆς πληγῆς· Ἀθηνᾶν δὲ εἶναι τὴν ἐπαφεῖσάν οἱ τὸν λίθον τοῦτον ὅντινα Σωφρονιστῆρα ὀνομάζουσιν.
This, say the Thebans, was painted here. And they also show the tomb of Herakles' children by Megara, relating the story of their death in no way differently than how Stesichorus of Himera and Panyassis described it in their poems. Further, the Thebans add that in his madness Herakles also intended to kill Amphitryon himself, but before this happened he was overcome by sleep because of the blow of a stone; and they say that Athena threw upon him this stone, which they call "the Saviour."