Bhagavatapurana 3.22.4

3.22.4

ato hy anyonyam ātmānaṃ brahma kṣatraṃ ca rakṣataḥ /
rakṣati smāvyayo devaḥ sa yaḥ sad-asad-ātmakaḥ //

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).