We took the liberty to make some enquiries concerning the ground of their pretentions to make war upon nations who had done them no injury , and observed that we considered all mankind as our friends who had done us no wrong, nor had given us any provocation ... The Ambassador 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.