Mahabharata 12.11.22

एतद्विदुस्तपो विप्रा द्वंद्वातीता विमत्सराःतस्माद्वनं मध्यमं च लोकेषु तप उच्यते

etadvidustapo viprā dvaṃdvātītā vimatsarāḥtasmādvanaṃ madhyamaṃ ca lokeṣu tapa ucyate

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