Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 7
Sanskrit:
एवं प्रजाभिर्दुष्टाभिराकीर्णे क्षितिमण्डले ।ब्रह्मविट्क्षत्रशूद्राणां यो बली भविता नृप: ॥ ७ ॥
ITRANS:
evaṁ prajābhir duṣṭābhirākīrṇe kṣiti-maṇḍalebrahma-viṭ-kṣatra-śūdrāṇāṁyo balī bhavitā nṛpaḥ
Translation:
As the earth thus becomes crowded with a corrupt population, whoever among any of the social classes shows himself to be the strongest will gain political power.