Biblical Context:
The account of the report to Abimelech is found in the book of Genesis, specifically in Genesis 20. This narrative occurs during the time of the patriarchs, a period marked by God's direct interactions with key figures such as Abraham, Isaac, and Jacob. Abimelech, the king of Gerar, plays a significant role in this episode involving Abraham and Sarah.

Narrative Summary:
In Genesis 20, Abraham journeys to the region of the Negev and settles between Kadesh and Shur, staying in Gerar. Fearing for his life due to Sarah's beauty, Abraham introduces her as his sister. Consequently, Abimelech, the king of Gerar, sends for Sarah and takes her into his palace. However, God intervenes by appearing to Abimelech in a dream, warning him that he is as good as dead because the woman he has taken is married.

Key Verses:
Genesis 20:3-7 provides the divine warning to Abimelech: "But God came to Abimelech in a dream by night and said to him, 'You are as good as dead because of the woman you have taken, for she is a married woman.' Now Abimelech had not gone near her, so he said, 'Lord, will You destroy a nation even though it is innocent? Did Abraham not tell me, "She is my sister," and did she not also say, "He is my brother"? I have done this with a clear conscience and clean hands.' Then God said to him in the dream, 'Yes, I know that you did this with a clear conscience, and so I have kept you from sinning against Me. That is why I did not let you touch her. Now return the man's wife, for he is a prophet, and he will pray for you and you will live. But if you do not return her, you can be sure that you and all who belong to you will die.'"

Theological Themes:
1. Divine Protection and Intervention: The narrative underscores God's protective hand over His covenant people. Despite Abraham's deception, God intervenes to protect Sarah and uphold His promise to Abraham. This divine intervention highlights God's sovereignty and His commitment to His covenant.

2. Moral Integrity and Accountability: Abimelech's response to God's warning demonstrates his moral integrity. He pleads his innocence, emphasizing that he acted with a clear conscience. God's acknowledgment of Abimelech's integrity and His prevention of sin illustrate the importance of moral accountability and divine justice.

3. Prophetic Role of Abraham: God identifies Abraham as a prophet, indicating his unique role as an intermediary between God and humanity. This designation emphasizes the importance of Abraham's prayers and the special relationship he has with God.

4. Fear and Faith: Abraham's fear for his life leads him to deceive Abimelech, revealing a moment of weakness in his faith. This aspect of the narrative serves as a reminder of the human tendency to rely on self-preservation rather than trusting in God's protection.

Historical and Cultural Insights:
The interaction between Abraham and Abimelech reflects the customs and social dynamics of the ancient Near East. The practice of claiming kinship to protect oneself was not uncommon, as it provided a measure of safety in foreign lands. Additionally, the narrative illustrates the significance of dreams as a means of divine communication, a common belief in the ancient world.

Significance in the Biblical Narrative:
The report to Abimelech is a pivotal moment in the Genesis narrative, reinforcing the themes of divine faithfulness and human fallibility. It serves as a testament to God's unwavering commitment to His promises, despite human shortcomings. This episode also foreshadows the continued protection and guidance that God provides to His chosen people throughout the biblical account.