Shared ground
Genesis 20:17–18 ends the Abimelech story by reporting a clear reversal. Abraham prays to God, and God “heals” Abimelech’s household so that childbirth resumes. The narrator then explains what needed reversing: Yahweh had previously shut down fertility across Abimelech’s house, and it happened “because of Sarah, Abraham’s wife.” These claims are stated directly in the text.
Two themes sit on the surface. First, God is presented as able to restrain and restore fertility at a household-wide level. Second, Abraham’s prayer is portrayed as the immediate occasion for the restoration that follows (as anticipated earlier in Genesis 20:7).
Where interpretation differs (only where needed)
What “healed” includes. Some readers take “healed” to mean the problem was specifically infertility (the next line explains closed wombs). Others think “healed” may include additional illness or harm connected to the crisis, even if the narrator highlights fertility as the main visible sign.
How Sarah relates to the cause. The text says the closing of wombs happened “because of Sarah.” Some take that as direct causation: Sarah’s presence in Abimelech’s house is the reason God acted. Others hear it as “on account of the Sarah-incident”—Sarah is the occasion for God’s intervention rather than an active agent.
Why the disagreement exists
The passage is compact and uses broad terms (“healed,” “house of Abimelech,” “because of Sarah”) without spelling out all mechanics or timing. Because v. 18 explains infertility while v. 17 uses the wider verb “heal,” readers differ on whether the author intends only one problem (infertility) or a broader set of effects.
What this passage clearly contributes
It confirms the narrative’s cause-and-effect chain: Abraham’s prayer is followed by God’s restoration, and the prior infertility is attributed to Yahweh’s action. It also reinforces that the crisis was not merely private but affected an entire household (wife and female servants), and that it was tied to Sarah’s endangerment in Abimelech’s house. The story closes with resolution: divine restraint is lifted, and normal family life resumes.