 [ ... ] a late Islamic fabrication because of the confusion in Islamic times which made it such a <unk> term as to include the inhabitants of the south as well as the north of the Arabian Peninsula . But <unk> of this extravagance , the concept is much more modest in its <unk> , and in the <unk> sources it applies only to certain groups among the Arabs of pre @-@ Islamic times . Some important statements to this effect were made by Muhammed when he identified some Arabs as Ishmaelites and others as not . 
