This was the rule which all of you made amongst you for having Draupadi as you common wife, that he who would by ignorance enter the room in which one of you would be with her, he must adopt Brahmacharya for twelve years.
परस्परं वर्तमानान् दुपदस्यात्मजां प्रति। यो नोऽनुप्रविशेन्मोहात् स वै द्वादशवार्षिकम्॥ वने चरेद् ब्रह्मचर्यमिति वः समयः कृतः।