En connaissant personnellement des Sabras dont la famille habite ce territoire depuis au moins le 19è siècle, je pense avoir un retour de première main
Mais si on veut un « retour » plus vérifiable, prenons par exemple un témoignage de 1929 sur les relations entre Juifs originaire de la région depuis au moins le 19è siècle et des Juifs ayant immigré plus récemment ( http://en.wikipedia.org/wiki/1929_Hebron_massacre ) :
"Eliezer Dan Silonim was born in Hebron in 1900. He was the son of Rabbi Yaakov Yosef, the Rabbi of Hebron. (...)
After the first victim was killed on Friday, 40 people assembled in Dan’s house, confident that because of his influence, no harm would come. On Saturday, the rioters approached the Rabbi and offered him a deal. If all the Ashkenazi yeshiva students were given over to the Arabs, the rioters would spare the lives of the Sephardi community. Rabbi Slonim refused to turn over the students and was killed on the spot, along with his wife and 4 year old son (another son, 3 years old, survived). In the end, 12 Sephardi Jews and 55 Ashkenazi Jews were murdered."
Ce n’est pas vraiment ce qu’on peut appeler une opposition entre Sepharades (Sabras) et Ashkenazes, plutôt le contraire !