And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the LORD. And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering; but unto Cain and to his offering He had not respect. And Cain was very wroth, and his countenance fell. And the LORD said unto Cain: ‘Why art thou wroth? and why is thy countenance fallen? If thou doest well, shall it not be lifted up? and if thou doest not well, sin coucheth at the door; and unto thee is its desire, but thou mayest rule over it.’ (Genesis 4:3–7)

וַיְהִי מִקֵּץ יָמִים, וַיָּבֵא קַיִן מִפְּרִי הָאֲדָמָה מִנְחָה לַה'. וְהֶבֶל הֵבִיא גַם הוּא מִבְּכֹרוֹת צֹאנוֹ וּמֵחֶלְבֵהֶן. וַיִּשַׁע ה' אֶל הֶבֶל וְאֶל מִנְחָתוֹ – וְאֶל קַיִן וְאֶל מִנְחָתוֹ לֹא שָׁעָה. וַיִּחַר לְקַיִן מְאֹד, וַיִּפְּלוּ פָּנָיו. וַיֹּאמֶר ה' אֶל קָיִן: לָמָּה חָרָה לָךְ וְלָמָּה נָפְלוּ פָנֶיךָ? הֲלוֹא אִם תֵּיטִיב – שְׂאֵת, וְאִם לֹא תֵיטִיב – לַפֶּתַח חַטָּאת רֹבֵץ, וְאֵלֶיךָ תְּשׁוּקָתוֹ וְאַתָּה תִּמְשָׁל בּוֹ. (בראשית ד', ג-ז)

Cain was hurt because the LORD regarded Abel but did not regard him. His hurt appears twofold: his own offering’s rejection, and his brother’s offering’s acceptance. This double emotion also appears in the description of his response: “Cain was very wroth” on the one hand, and “his countenance fell” on the other (Genesis 4:5).

Most classical commentators interpret the LORD’s words to Cain as explaining his sacrifice’s rejection. On this reading, “If thou doest well, shall it not be lifted up?” means: if you behave properly, I shall favor you and accept your offering. The rejection thus results from an earlier sin, such as presenting an unsuitable offering. By contrast, “and if thou doest not well, sin coucheth at the door” is understood as a warning against future sin: sin, or the evil inclination, lies in wait as a threatening entity awaiting an opportunity to cause a person to stumble. Accordingly, “and unto thee is its desire” describes the evil inclination’s desire to lead a person astray, while “but thou mayest rule over it” expresses the human ability to govern and overcome that inclination (Genesis 4:7).

Notice that on this interpretation the LORD’s answer addresses only the rejection of Cain’s own offering, leaving his jealousy of his brother Abel unanswered.

The phrase “and unto thee is its desire, but thou mayest rule over it” immediately recalls the parallel words spoken to the woman after the sin: “and thy desire shall be to thy husband, and he shall rule over thee” (Genesis 3:16). Admittedly, already in the tree of knowledge story a factor tempts humanity to sin – the serpent, which can be regarded as an expression of the evil inclination. At first sight, this might suggest the same pattern in Cain and Abel’s story. A careful comparison, however, raises two difficulties for this interpretation.

First, in the tree of knowledge story the serpent, symbolizing the evil inclination, is not described as a force to be restrained or ruled, but as a factor to be rejected and resisted. The man and his wife are not required to “rule” the evil inclination, but to avoid listening to it altogether.

Second, in Eden’s story the woman is not depicted as seeking to make her husband stumble or harm him, but as dependent on him and needing him. It is therefore difficult to interpret Cain’s case as involving someone whose desire is to make him stumble, whom Cain must overcome. More plausibly, the expression should be understood here as in Eden: as a relationship of dependence and authority.

Modern Hebrew commonly understands teshuqah, “desire,” as erotic attraction, and that meaning certainly fits “I am my beloved’s, And his desire is toward me” (Song of Songs 7:11). But the word is rare, appearing only twice more in Scripture, both in Parashat Bereshit: in Eden’s story and Cain’s. Its biblical Hebrew meaning may therefore differ.

The Genesis context couples “desire” with rule, allowing us to understand desire as rule’s opposite parallel: submission to and need for the ruler.

For example, Rabbi Samuel ben Hophni Gaon explains Pharaoh’s words to Joseph, “Thou shalt be over my house, and according unto thy word shall all my people be ruled” (Genesis 41:40). The Hebrew verb is יִשַּׁק, yishaq:

“All my people shall be ruled” – he means that they will submit to his authority and his words, similarly to the statement: “and thy desire shall be to thy husband” (Genesis 3:16). (Rabbi Samuel ben Hophni Gaon, commentary on Genesis 41:40)

יִשַּׁק כָּל עַמִּי – כוונתו לכך שיהיו סרים למרותו ולדבריו, בדומה לנאמר: 'וְאֶל אִישֵׁךְ תְּשׁוּקָתֵךְ' (בראשית ג, טז).

In Eden’s story the man rules, and his wife submits to and needs him. In Joseph’s case in Egypt, Joseph is “ruler over all the land of Egypt” (Genesis 45:26), and the Egyptians submit to his authority. Who, then, is submissive and dependent in Cain’s case?

The answer may be found in the Septuagint:

If you bring it [the offering] properly but do not divide it properly, have you not sinned? Lie down [that is, calm yourself or be quiet]; his desire is toward you, and you shall rule over him. (Septuagint, Genesis 4:7; translated from the Hebrew rendering cited here)

הלוא אם תביא אותה [את המנחה] כראוי, אך לא תחלק אותה כראוי, האם לא חטאת? רבוץ [=הירגע/היה שקט], אליך תשוקתו ואתה תמשול בו.

The Hebrew text underlying the Septuagint seems different from the Masoretic text. Nevertheless, it may illuminate the verse’s enigmatic wording as we have it.

Unlike the Masoretic text, “sin coucheth at the door,” which permits understanding “sin” as an external entity – the evil inclination – lying in wait to harm Cain, the Septuagint interprets ḥattat as a verb: “you sinned,” “you erred.” Sin is not lying in wait at the door; it has already occurred and, according to the Septuagint, concerns how the offering was brought and divided.

The continuation – “and unto thee is its desire, but thou mayest rule over it” – consequently cannot refer to the evil inclination, which is never mentioned. The expression thus refers to Abel, the younger brother subordinate to the firstborn Cain and accepting his authority, just as the parallel verse in Eden describes a hierarchical relationship of dependence and rule between the man and his wife: “and thy desire shall be to thy husband, and he shall rule over thee” (Genesis 3:16). JPS uses “its” and “it” in Genesis 4:7; the author’s interpretation takes the Hebrew masculine pronouns as “his” and “him,” referring to Abel.

In light of the Septuagint, the complete Masoretic verse can be understood as follows:

“If thou doest well, shall it not be lifted up?” – if you improve your conduct, I shall favor you and accept your offering.
“and if thou doest not well, sin coucheth at the door” – if you do not improve your conduct, sin awaits at your door, and ultimately you will stumble and be punished.
“and unto thee is its desire, but thou mayest rule over it” – as for Abel, do not worry. I do not prefer him to you. Abel still submits to and needs you, and you, as the firstborn, rule over him. (Genesis 4:7, with the author’s explanation)

הֲלוֹא אִם תֵּיטִיב, שְׂאֵת – הלא אם תטיב את דרכך – אשא פניך ואקבל את מנחתך.
וְאִם לֹא תֵיטִיב, לַפֶּתַח חַטָּאת רֹבֵץ – ואם לא תטיב את דרכך – החטא אורב לפתחך, ובסופו של דבר תיכשל ותיענש.
וְאֵלֶיךָ תְּשׁוּקָתוֹ וְאַתָּה תִּמְשָׁל בּוֹ – ואשר להבל, אל דאגה. אינני מעדיף אותו על פניך. הבל עדיין כנוע וזקוק לך, ואתה כבכור מושל בו.

On this explanation, the LORD’s words address both sources of Cain’s hurt. He explains why Cain’s offering was rejected – because his actions were flawed – and answers his jealousy of Abel, reassuring him. Accepting Abel’s offering does not impair Cain’s firstborn status, and the brothers’ relationship remains unchanged: Abel continues to depend on Cain, and Cain continues to rule over him.