Mahabharata 12.314.40

ब्राह्मणाय सदा देयं ब्रह्म शुश्रूषवे भवेत्ब्रह्मलोके निवासं यो ध्रुवं समभिकाङ्क्षति

brāhmaṇāya sadā deyaṃ brahma śuśrūṣave bhavetbrahmaloke nivāsaṃ yo dhruvaṃ samabhikāṅkṣati

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