Sarah Laughs: God's Promise at Mamre
Genesis 18:1–15 turns on a question God asks himself: is anything too hard for Yahweh? Sarah's laugh and her fear are met not with rebuke alone but with a promise fixed to a time.
Genesis 18:1–8: Three Visitors at Abraham's Tent
Genesis 18:1–8 records a visible visit: three travelers stand near Abraham's tent, he runs to serve them, and they eat. The scene teaches reverent hospitality and God's promise, not a technique for detecting angels among us.