Jewish extremists have urged supermodel Bar Refaeli not to marry her actor boyfriend, Leonardo DiCaprio, because it would dilute the Jewish race, according to media reports.

In a letter to Refaeli, far-rightist Baruch Marzel wrote on behalf of nationalist group Lehava, which aims to fight assimilation among Jews: “It is not by chance that you were born Jewish.

“Your grandmother and her grandmother did not dream that one of their descendants would one day remove the family’s future generations from the Jewish people,” the letter continued. “Assimilation has forever been one of the enemies of the Jewish people.”

Lehava in Hebrew means “flame” but it is also an acronym for “Preventing Assimilation in the Holy Land.” According to the group’s Facebook page, it aims to provde assistance to Jewish girls in relationships with non-Jews, and especially Arabs.

Marzel told Refaeli that he “has nothing against Mr. DiCaprio, who I have no doubt is a talented actor.” Still, he urged Refaeli: “Come to your senses, look forward and back too – and not only the present. Don’t marry Leonardo DiCaprio, don’t harm the future generations.”