四分律行事鈔資持記 2.1322

2.1322

釋中。二律伴行，雖非是賊；或恐近習，或生譏過，故制。準此遊方必擇良伴。不犯者，先不知，不共結伴，逐行得安隱，力勢命梵等，並開。

In the explanation: Although the companion traveling under the two rules is not a thief, it was prohibited out of fear that familiarity might arise, or that criticism and fault might be produced. According to this, when traveling abroad one must choose good companions. Non-offenses: not knowing beforehand, not forming a companionship together, following along to attain safety, difficulties concerning strength, life, or celibacy, etc., are all exceptions.