Jadunath Sarkar Quote

No peace between Mohammadan king and neighbouring of infidel states : According to the Quranic law, there can not be peace between a Mohammedan king and his neighbouring infidel states. The latter are Dar-ul-Harb or legitimate stated for war, and it is the Muslim king's duty to slay and plunder them (non-Muslims) till they accept the true faith (Islam) and become Dar-ul-Islam. (Land of Muslims alone), after which they will become entitled to his (Muslim king's) protection.

Shivaji and his Times, pages 479-480, by Sir Jadunath Sarkar; published by Orient Longman.