History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
The next day, the troops at Oropus and those at Delium, having left a garrison in it, (for they still continued to hold it notwithstanding,) returned home by sea.
The Boeotians, after erecting a trophy, taking up their own dead, stripping those of the enemy, and leaving a guard over them, retired to Tanagra, and formed plans for assaulting Delium.
Meanwhile, a herald from the Athenians, coming to ask back the dead, met a Boeotian herald, who turned him back, and told him that he would gain nothing before he himself had come back again. Then he went to the Athenians, and delivered the message of the Boeotians, viz.
that they had not acted right in violating the laws of the Greeks. For it was a principle acknowledged by all, that in an invasion of each other's territory, they should abstain from injuring the temples that were in it.