What role did Isaac play in the Hebrew Bible?

Isaac's role in the Hebrew Bible is predominantly that of the only son of Abraham and his wife Sarah. This relationship is significant as it establishes Isaac as a key figure in the Abrahamic lineage, which is central to the narratives found in the Torah. His birth, which occurred when Abraham and Sarah were advanced in age, is often seen as a miraculous event. Additionally, Isaac is part of the covenant that God made with Abraham, where he is promised that he would be the ancestor of a great nation. This underscores Isaac's importance in the genealogical and theological context of the Israelites and their belief system.

The other choices do not accurately reflect Isaac's role. For instance, he was never a king of the Israelites, nor did he lead the Egyptians as a prophet. Furthermore, he is not the father of Moses; that distinction belongs to Amram and Jochebed. Therefore, identifying Isaac as the only son of Abraham with Sarah is the most accurate representation of his role in the Hebrew Bible.