Passage 3.18.6
τάδε μὲν ἐς τοσοῦτον ἐξητάσθω· ἐς Ἀμύκλας δὲ κατιοῦσιν ἐκ Σπάρτης ποταμός ἐστι Τίασα· θυγατέρα δὲ νομίζουσιν εἶναι τοῦ Εὐρώτα τὴν Τίασαν, καὶ πρὸς αὐτῇ Χαρίτων ἐστὶν ἱερὸν Φαέννας καὶ Κλητᾶς, καθὰ δὴ καὶ Ἀλκμὰν ἐποίησεν. ἱδρύσασθαι δὲ Λακεδαίμονα Χάρισιν ἐνταῦθα τὸ ἱερὸν καὶ θέσθαι τὰ ὀνόματα ἥγηνται.
Let these inquiries go thus far. On the way down from Sparta toward Amyclae is a river called Tiasa. They believe that Tiasa is the daughter of Eurotas, and near it stands a sanctuary of the Graces, Phaënna and Cleta, as Alcman has also written. The Lacedaemonians hold that it was Lacedaemon himself who established this sanctuary to the Graces and gave them their names.