Passage 8.20.4
οἱ δὲ τὸν Ἀπόλλωνος ἔρωτα ἐς αὐτὴν ᾄδοντες καὶ τάδε ἐπιλέγουσιν, Ἀπόλλωνα Λευκίππῳ νεμεσῆσαι τῆς ἐς τὸν ἔρωτα εὐδαιμονίας. αὐτίκα δὲ ἐπεθύμησεν ἐν τῷ Λάδωνι ἡ Δάφνη καὶ αἱ λοιπαὶ παρθένοι νήχεσθαι, καὶ τὸν Λεύκιππον ἀποδύουσιν ἄκοντα· ἰδοῦσαι δὲ οὐ παρθένον τοῖς τε ἀκοντίοις αὐτὸν καὶ ἐγχειριδίοις τύπτουσαι διέφθειραν.
Those who sing about Apollo's love for her also recount this—that Apollo resented Leucippus for his success in love. Then Daphne and the other maidens wished to bathe in the Ladon, and they undressed Leucippus against his will. When they saw that he was not a girl, they struck him with spears and daggers and thus killed him.