Passage 2.3.11
βασιλεύειν μὲν δὴ διʼ αὐτὴν Ἰάσονα ἐν Κορίνθῳ, Μηδείᾳ δὲ παῖδας μὲν γίνεσθαι, τὸ δὲ ἀεὶ τικτόμενον κατακρύπτειν αὐτὸ ἐς τὸ ἱερὸν φέρουσαν τῆς Ἥρας, κατακρύπτειν δὲ ἀθανάτους ἔσεσθαι νομίζουσαν· τέλος δὲ αὐτήν τε μαθεῖν ὡς ἡμαρτήκοι τῆς ἐλπίδος καὶ ἅμα ὑπὸ τοῦ Ἰάσονος φωραθεῖσαν---οὐ γὰρ αὐτὸν ἔχειν δεομένῃ συγγνώμην, ἀποπλέοντα δὲ ἐς Ἰωλκὸν οἴχεσθαι---, τούτων δὲ ἕνεκα ἀπελθεῖν καὶ Μήδειαν παραδοῦσαν Σισύφῳ τὴν ἀρχήν.
Jason indeed reigned in Corinth through her [Medea]; Medea bore children, but each time she gave birth, she would conceal the infant by carrying it to the sanctuary of Hera, believing that by hiding them there they would become immortal. In the end, however, she realized her hope had been mistaken; at the same time she was discovered by Jason—for he did not pardon her although she begged him, but rather sailed away to Iolcus. Because of these events, Medea departed as well, handing over the rule to Sisyphus.