Passage 6.23.5
ἔστι δὲ καὶ τρίτος γυμνασίου περίβολος, ὄνομα μὲν Μαλθὼ τῆς μαλακότητος τοῦ ἐδάφους ἕνεκα, τοῖς δὲ ἐφήβοις ἀνεῖται τῆς πανηγύρεως τὸν χρόνον πάντα. ἔστι δὲ ἐν γωνίᾳ τῆς Μαλθοῦς πρόσωπον Ἡρακλέους ἄχρι ἐς τοὺς ὤμους, καὶ ἐν τῶν παλαιστρῶν μιᾷ τύπος Ἔρωτα ἔχων ἐπειργασμένον καὶ τὸν καλούμενον Ἀντέρωτα· ἔχει δὲ ὁ μὲν φοίνικος ὁ Ἔρως κλάδον, ὁ δὲ ἀφελέσθαι πειρᾶται τὸν φοίνικα ὁ Ἀντέρως.
There is also a third enclosure of the gymnasium, called Maltho, because of the softness of its ground. During the festival period, it is open to the youths for the entire duration. In a corner of the Maltho there is a bust of Heracles reaching down to the shoulders, and in one of the wrestling schools there is a relief representing Eros and the figure called Anteros. The Eros holds a branch of palm, while the Anteros attempts to take it away from him.