Why does the LXX change 'Yahweh struck' to 'God tested' at Genesis 12:17?

The Masoretic Text of Genesis 12:17 is direct:

וַיְנַגַּע יְהוָה אֶת־פַּרְעֹה נְגָעִים גְּדֹלִים וְאֶת־בֵּיתוֹ עַל־דְּבַר שָׂרַי אֵשֶׁת אַבְרָם

vayenagga' Yahweh et-Par'oh nega'im gedolim ve-et-beito al-devar Sarai eshet Avram

"And Yahweh struck Pharaoh with great plagues, and his house, on account of Sarai, wife of Abram." — Genesis 12:17 (MT)

The Septuagint translates it differently:

καὶ ἤτασεν ὁ θεὸς τὸν Φαραώ ἐτασμοῖς μεγάλοις καὶ πονηροῖς

kai ētasen ho theos ton Pharaō etasmois megalois kai ponērois

"And God tested Pharaoh with great and evil examinations." — LXX Genesis 12:17

Two specific changes appear in the Greek.

Change one: the divine name

The Hebrew uses the Tetragrammaton — יְהוָה, Yahweh, the covenant name. The LXX renders it with ho theos ("God") rather than its standard rendering κύριος (Kyrios, "Lord"), which is what the LXX typically uses for the Tetragrammaton. The use of theos instead of kyrios in pagan-household contexts is a recognizable LXX tendency. Genesis 20:3 and 20:6, where Yahweh speaks in a dream to the pagan king Abimelech, also use theos rather than kyrios in the divine address. By contrast, Genesis 20:18, where Yahweh closes up the wombs of Abimelech's household, returns to kyrios. The pattern appears to be that theos is preferred when a pagan ruler is the primary addressee and the divine speech could be confused with a pagan god's oracle. Whether this is a deliberate theological softening or a translation convention is debated. The Greek text does not name the covenant God directly in the confrontation with Pharaoh's household.

Change two: the verb

The Hebrew verb is vayenagga' — H5060 naga' in the piel conjugation (third-person masculine singular sequential imperfect). The qal of naga' means "to touch"; the piel is the intensive D-stem, sharpening the meaning to "strike hard, afflict with disease." The subject is Yahweh; the objects are Pharaoh and his house; the cause is Sarai. The piel naga' is physical and forceful.

The Greek replaces this with ἤτασεν — from ἐτάζω (etazō), which means "to examine, test, scrutinize." In judicial and administrative contexts, etazō is the verb of interrogation and inquiry. The semantic shift is from physical affliction to juridical examination. Yahweh does not "strike" Pharaoh in the LXX; he "examines" or "tests" him. The noun in the same clause follows the same logic: Hebrew nega'im (H5061, "blows, plagues, disease-marks") becomes etasmois ("examinations").

What the shift reveals

The MT's moral difficulty is plain. Abram lied. Sarai was taken into Pharaoh's house. And then Yahweh struck Pharaoh — a foreign king who took in what appeared to be an unmarried woman, not a pagan who abducted a married one. The moral pressure on the narrative is real: why is Pharaoh struck for what Abram caused?

The LXX's lexical choices smooth that pressure. "Examined" is softer than "struck." "God" is less covenant-committed than "Yahweh." The Greek renders the scene as a judicial inquiry rather than a physical assault.

But the text-critical principle here is firm: the harder reading is typically the more original one. When two witnesses diverge and one is easier to explain as a theological improvement of the other, the harder reading carries more weight. The MT says Yahweh struck Pharaoh. That is the difficult claim. The LXX has motive to soften it; the MT has no motive to harden what was originally soft.

Second Temple tradition confirms the difficulty. Jubilees 13 retells the entire pericope and omits the sister-ruse altogether, so that Sarai is simply seized rather than handed over by Abram's calculated scheme. The moral problem was felt acutely enough that a pseudepigraphal retelling chose excision over explanation. The MT keeps it.

LXX Genesis 13:10: the opposite direction

It is worth noting that the LXX does not always soften. At Genesis 13:10, where Lot sees the Jordan plain described as ke-gan Yahweh ("like the garden of Yahweh"), the LXX renders the phrase as hōs ho paradeisos tou theou — "like the paradise of God." The noun παράδεισος (G3857) is the same word LXX Genesis 2:8 uses for Eden. The Eden-echo the Hebrew suggests is fully preserved and intensified in the Greek. The LXX is not systematically softening the text; it is making localized theological adjustments at specific points of moral difficulty — and Gen 12:17 is one of those points.

The full study examines both LXX changes at Gen 12:17, the Jubilees excision of the sister-ruse, and the DSS 8Q1 fragment (which aligns with the MT) in Abram, Sarai, and Lot.