Article: The first record of the name Israel (as ysrir) occurs in the Merneptah stele, erected for Egyptian Pharaoh Merneptah c. 1209 BCE, "Israel is laid waste and his seed is not." This "Israel" was a cultural and probably political entity of the central highlands, well enough established to be perceived by the Egyptians as a possible challenge to their hegemony, but an ethnic group rather than an organised state; Ancestors of the Israelites may have included Semites native to Canaan and the Sea Peoples. McNutt says, "It is probably safe to assume that sometime during Iron Age a population began to identify itself as 'Israelite'", differentiating itself from the Canaanites through such markers as the prohibition of intermarriage, an emphasis on family history and genealogy, and religion.

Now answer this question: What did Canaanites prohibit?
intermarriage