Mahabharata 13.107.121
प्राङ्मुखः श्मश्रुकर्माणि कारयेत समाहितःउदङ्मुखो वा राजेन्द्र तथायुर्विन्दते महत्
prāṅmukhaḥ śmaśrukarmāṇi kārayeta samāhitaḥudaṅmukho vā rājendra tathāyurvindate mahat
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book