Mahabharata 15.25.16

कर्मणा मनसा वाचा चक्षुषा चापि ते नृपसंनियम्येन्द्रियग्राममास्थिताः परमं तपः

karmaṇā manasā vācā cakṣuṣā cāpi te nṛpasaṃniyamyendriyagrāmamāsthitāḥ paramaṃ tapaḥ

Our plain-language meaning of this verse is waiting for scholar review.