Passage 9.13.10
ὡς δὲ ἄλλοι τε Λακεδαιμονίων τῶν ἐν τέλει καὶ ὁ βασιλεὺς ἐτεθνήκει Κλεόμβροτος, ἐνταῦθα καὶ τοὺς Σπαρτιάτας καὶ ταλαιπωρουμένους ἐπελάμβανεν ἀνάγκη μὴ ἐνδιδόναι· παρὰ γὰρ τοῖς Λακεδαιμονίοις αἴσχιστον ἐδέδοκτο εἶναι βασιλέως νεκρὸν ἐπὶ ἀνδράσι πολεμίοις γενόμενον περιοφθῆναι.
But when Cleombrotus, the king, as well as other high-ranking Lacedaemonians had fallen, then even in their distress necessity compelled the Spartans not to yield; for among the Lacedaemonians, it was considered most shameful that the body of a king who had fallen among enemy forces should be left abandoned to them.