Bhagavatapurana 3.22.3

3.22.3

tat-trāṇāyāsṛjac cāsmān doḥ-sahasrāt sahasra-pāt /
hṛdayaṃ tasya hi brahma kṣatram aṅgaṃ pracakṣate //

3. For their (Brahmanas') protection the thousand-footed Lord created us from his thousand arms. Verily the wise say, the Brahmin caste forms his heart, and the Kshatria the members of his body; Therefore the Brahmanas and the Kshatriyas protect each other; Indeed the Lord who is both Sat and Asat (cause and effect) and yet destitute of change, is the protector (of all).