Histories

Then Cleomenes' plan was this: He had with him some deserters from whom he learned the names, then he sent a herald calling by name the Argives that were shut up in the sacred precinct and inviting them to come out, saying that he had their ransom. (Among the Peloponnesians there is a fixed ransom of two minae to be paid for every prisoner.) So Cleomenes invited about fifty Argives to come out one after another and murdered them.

Somehow the rest of the men in the temple precinct did not know this was happening, for the grove was thick and those inside could not see how those outside were faring, until one of them climbed a tree and saw what was being done. Thereafter they would not come out at the herald's call.