Pratimoksha of the Dharmaguptakas 1.126

1.126

「若比丘！二宿、三宿軍中住，或時觀軍陣鬪戰，若觀遊軍象馬力勢者，波逸提（五十）。

If a monk, residing in the place where an army is assembled, for two or three nights, should go to witness an engagement, or see the army when exercising, or feats of strength of the elephants or cavalry, it is pācittiya.