Plato, Laws 633b

τρίτον τοίνυν, ἔγωγʼ εἴποιμʼ ἂν καὶ Λακεδαιμονίων ὁστισοῦν, τὴν θήραν ηὗρε. τέταρτον δέ, ἢ πέμπτον εἰ δυναίμεθα, λέγειν πειρώμεθα. ἔτι τοίνυν καὶ τὸ τέταρτον ἔγωγε πειρῴμην ἂν λέγειν, τὸ περὶ τὰς καρτερήσεις τῶν ἀλγηδόνων πολὺ παρʼ ἡμῖν γιγνόμενον, ἔν τε ταῖς πρὸς ἀλλήλους ταῖς χερσὶ μάχαις καὶ ἐν ἁρπαγαῖς τισιν διὰ πολλῶν πληγῶν ἑκάστοτε γιγνομένων· ἔτι δὲ καὶ κρυπτεία τις ὀνομάζεται θαυμαστῶς πολύπονος

The third thing he devised was hunting: so I and every Lacedaemonian would say. Let us attempt also to state what comes fourth,—and fifth too, if possible. The fourth also I may attempt to state: it is the training, widely prevalent amongst us, in hardy endurance of pain, by means both of manual contests and of robberies carried out every time at the risk of a sound drubbing; moreover, the Crypteia, as it is called, affords a wonderfully severe training