Mahabharata 12.132.14

ब्रह्मक्षत्रं संप्रविशेद्बहु कृत्वा सुदुष्करम्उच्यमानोऽपि लोकेन बहु तत्तदचिन्तयन्

brahmakṣatraṃ saṃpraviśedbahu kṛtvā suduṣkaramucyamāno'pi lokena bahu tattadacintayan

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