Thomas JeffersonIn a letter to John Jay, Thomas Jefferson wrote-

“The Ambassador (Ambassador Abdrahaman) answered us that it was founded on the Laws of their Prophet, that it was written in their Koran, that all nations who should not have acknowledged their authority were sinners, that it was their right and duty to make war upon them wherever they could be found, and to make slaves of all they could take as Prisoners, and that every Musselman [Muslim] who should be slain in battle was sure to go to Paradise.”

Source- Wheelan, Joseph, Jefferson’s War- America’s First War on Terror 1801-1805, Carroll & Graf, 2004, pp. 40-41.