Katherine Southwood emphasizes that Ezra and Nehemiah are similar in their views of intermarriage in that both Ezra and Nehemiah allude to the Deuteronomic text in their narratives, and believe intermarriage to be a type of transgression. There are other similar nuances that lead some scholars to believe that they are from a similar source. However, there are also differences in the two sources that should not be forgotten. Firstly, the intermarriage debate is between different classes of people, each of which is trying to reserve their sense of ethnicity. Ezra argues that marriage with non-exilic Jews is a transgression, and Nehemiah emphasizes that marriage to non-Jews is a sin. Even though this book says specific groups, the book of Ezra prohibits all exogamy. According to Christine Hayes, Ezra is concerned about the holy seed being profaned since he believes God has chosen his people as being holy. Since anyone that is not inside of the chosen group is considered not holy, it would be sinful to marry and reproduce with them, according to Ezra. Scholars also believe that there were further political reasons behind Nehemiah's protest against intermarriage, and Ezra had a variety of different reasons. In either case, these two viewpoints on intermarriage with exogamous groups have differences, but ultimately, each is trying to promote and protect the ethnicity of their own group.