Another scholar, Paul Heger, takes a different stance on the expulsion of the Gentiles in Ezra–Nehemiah. According to Heger, Ezra's motive for expelling Gentile women and their offspring was because at the time leaders believed that the identity of the Israelites did not depend of the ethnicity of their mothers, but depended on the seed of their fathers. The motive behind prohibiting intermarriage with all Gentile women was due to the danger of assimilation resulting from the influence of social interaction with the surrounding nations. The expulsion of the foreign women and their offspring was directed in order to preserve the purity of the Israelite "holy seed". Thus, Ezra did not introduce the idea of matrilineal identity.