Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answered 3 years ago

It refers to the desert Arabs (the Bedouins); one way this is clear is that it is referring to them as "them" rather than "us". 

Keeping in mind, also, that what is conceived of as "the Arab world" today did not exist back then since most of the Middle East did not become culturally or linguistically Arab until the expansion of the Arab-Muslim state after the time of the Prophet (S).