Mahabharata 12.261.22

चतुर्द्वारं पुरुषं चतुर्मुखं; चतुर्धा चैनमुपयाति निन्दाबाहुभ्यां वाच उदरादुपस्था;त्तेषां द्वारं द्वारपालो बुभूषेत्

caturdvāraṃ puruṣaṃ caturmukhaṃ; caturdhā cainamupayāti nindābāhubhyāṃ vāca udarādupasthā;tteṣāṃ dvāraṃ dvārapālo bubhūṣet

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