Manusmriti
अद्भ्योऽग्निर्ब्रह्मतः क्षत्रमश्मनो लोहमुत्थितम् । तेषां सर्वत्रगं तेजः स्वासु योनिषु शाम्यति ॥ ३२१ ॥
Fire sprang from water, Kshatriyas from Brahmanas, iron from stone; the all-penetrating force of those (three) has no effect on that whence they were produced.
english translation
adbhyo'gnirbrahmataH kSatramazmano lohamutthitam । teSAM sarvatragaM tejaH svAsu yoniSu zAmyati ॥ 321 ॥
hk transliteration by Sanscript