Shared ground
Genesis 12:17–20 presents a sharp reversal: Abram’s attempt to protect himself by calling Sarai his “sister” ends with Pharaoh’s household struck by “great plagues,” Pharaoh confronting Abram, and Abram being sent away. The narrator makes the key point explicit: the plagues came “because of Sarai,” identified plainly as “Abram’s wife.” The crisis is tied to a mismatch between Sarai’s real status and Pharaoh’s actions based on Abram’s statement.
The passage also highlights how wrongdoing can harm bystanders. Pharaoh depicts himself as acted against (“What have you done to me?”) and explains that Abram’s words led to Pharaoh taking Sarai “to be my wife.” Whatever Pharaoh’s intent, the outcome is presented as dangerous and requires immediate reversal.
Where interpretation differs
Some readers think the text implies Pharaoh had already taken Sarai as a full wife in the sense of consummated marriage; others think it describes a step in the process of adding her to the royal household, stopped before completion. The wording (“I took her to be my wife”) supports a real taking, but the story does not describe what happened inside the household.
There is also some difference in how people understand “because of Sarai.” Many take it as a direct cause: God strikes Pharaoh’s household to protect Sarai and to expose the situation. Others stress that the phrase points to Sarai as the occasion for the plagues (her presence and misidentified status), without giving details about the mechanism or timing.
A smaller question concerns verse 20: “they brought him on the way.” Some read this mainly as expulsion under guard; others see both expulsion and protection (an official escort ensuring departure without further conflict).
Why the disagreement exists
The narrative is selective. It states the reason for the plagues but not their medical or social form, how Pharaoh learned the truth, or what exactly occurred between Sarai and Pharaoh’s household. Because those details are unstated, interpreters infer the most likely scenario from the verbs (“took”), the public confrontation, and the final escort.
What this passage clearly contributes
Explicitly, the passage portrays Yahweh acting against a powerful ruler’s household when Sarai—Abram’s wife—is wrongly taken, and it portrays Pharaoh recognizing that Abram’s deception put Pharaoh in the wrong position. The confrontation scene assigns moral weight to truth-telling about marriage and family ties, and it shows a foreign ruler demanding correction. The ending underscores separation: Abram leaves Egypt with Sarai and “all that he had,” but under Pharaoh’s direction and supervision. See also Genesis 12:10 for the setup and Genesis 12:13 for Abram’s earlier claim about Sarai.