Mahabharata 12.73.4

वायुरुवाचब्रह्मणो मुखतः सृष्टो ब्राह्मणो राजसत्तमबाहुभ्यां क्षत्रियः सृष्ट ऊरुभ्यां वैश्य उच्यते

vāyuruvācabrahmaṇo mukhataḥ sṛṣṭo brāhmaṇo rājasattamabāhubhyāṃ kṣatriyaḥ sṛṣṭa ūrubhyāṃ vaiśya ucyate

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