From the Laws of Manu
unexpurgated translation, for what’s its worth

Chapter 4. The rules for a householder

61.

He must not live in a country governed by Sudras, nor in one inhabited by impious men, nor in one conquered by heretics, nor in one abounding with men of lower castes.

79.

He must not be in the company of outcasts, nor of Chandalas, the lowest of men, nor of mixed races, nor of idiots, nor of men of low class, nor of gravediggers.

Chapter 8.

22.

A kingdom peopled mostly by Sudras, filled with godless men and deprived of twice-born (Aryan/noble) inhabitants, will soon wholly perish, stricken by hunger and disease.