Genesis 18: 1-17. Jacob uses the Midrash Tanchuma to unpack this section. Abraham was recovering from circumcision, and God visited him. Lesson: we should visit the sick, because that is important to God. PreTemple construction you could build an earth alter and offer sacrifices and God would show up and bless you, you could draw near to God. How are circumcision and sacrifice connected? Why was Abraham at the Oaks of Mamre and not at some other oaks? What does the heat of the day that Abraham was staying out of have to do with the end time wrath of God? Many other interesting discussions! Enjoy!