I. Introduction
A. Transition from the events in Genesis 17, specifically God’s covenant with Abraham and the institution of circumcision
B. Introduction to the narrative of the visitation of three angels to Abraham in Genesis 18
II. The Visit of the Three Angels
A. Verses 1-2: Abraham sees three men standing near his tent and offers them hospitality
B. Verses 3-8: Abraham prepares a meal for the visitors and serves them, demonstrating his hospitality and respect
C. Verses 9-10: The visitors inquire about Sarah, and one of them announces that Sarah will have a son
III. Sarah’s Reaction and the Promise of Isaac
A. Verses 11-12: Sarah, listening from inside the tent, laughs at the idea of bearing a child in her old age
B. Verses 13-15: The visitor, identified as the Lord, questions Sarah’s laughter and confirms that nothing is too difficult for the Lord
C. Verses 16-17: The Lord reiterates His promise of a son through Sarah and Abraham
D. Verses 18-19: The Lord discloses His purpose for visiting Abraham and His confidence in Abraham’s faithfulness
IV. Abraham’s Plea for Sodom
A. Verses 20-21: The Lord informs Abraham about the outcry against Sodom and Gomorrah’s wickedness
B. Verses 22-33: Abraham intercedes for the righteous in Sodom, engaging in a negotiation with the Lord to spare the city
V. Conclusion
A. Summary of the events in Genesis 18
B. Transition to the subsequent chapters and the further development of Abraham’s story
Note: This outline provides a general structure of Genesis 18, focusing on the visitation of the three angels to Abraham, Sarah’s reaction, the promise of Isaac, and Abraham’s intercession for Sodom. It highlights Abraham’s hospitality, Sarah’s disbelief, and the negotiation with the Lord. The actual chapter contains additional details, dialogues, and interactions that are not included in this outline.