Mahabharata 12.262.21

धर्ममेतं चतुष्पादमाश्रमं ब्राह्मणा विदुःआनन्त्यं ब्रह्मणः स्थानं ब्राह्मणा नाम निश्चयः

dharmametaṃ catuṣpādamāśramaṃ brāhmaṇā viduḥānantyaṃ brahmaṇaḥ sthānaṃ brāhmaṇā nāma niścayaḥ

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