מדרש אויף בראשית 30:17

R. Chelbo again questioned R. Samuel b. Nachmeni: "It is written (Gen. 30, 25) And it came to pass, when Rachel had borne Joseph, etc. Why when Joseph was born?" And he answered: "Because Jacob our father saw that the descendants of Esau would become submissive only to the descendants of Joseph, as it is said (Oba. 1, 18) And the house of Jacob shall be a fire, and the house of Joseph a flame, and the house of Esau stubble." R. Chelbo objected to him from (I. Sam. 30, 17) "And David smote them from the twilight even unto the evening of next day," etc. (Hence we see that they were submissive also to David, who was a descendant of Judah, and not of Joseph). Samuel answered: "The one who made you read the prophets did not read with thee Hagiographa, in which it is written (I Chron. 12, 21) And as he was going over to Ziklag… . captains of the thousands that belonged to Manasseh." [Hence they were submissive to the descendants of Joseph]. R. Joseph objected from (Ib. 4, 42, 43) And some of them, even of the sons of Simeon, five hundred men, went to Mount Seir, having at their head Pelatiyah and Nearyah and Rephayah, and Uzzie, the sons of Yishi. And they smote the rest of the Amalekites that had escaped, and dwelt there unto this day. Rabba b. Shila thereupon said: "Yishi was a descendant of Manasseh, as it is written (Ib. 5, 24) and the children of Manasseh were Epher and Yishi."

“Jacob came from the field in the evening, and Leah went out to meet him and said: You will consort with me, for I have hired you with my son’s mandrakes. He lay with her that night” (Genesis 30:16).
“God listened to Leah and she became pregnant and gave birth to Jacob, a fifth son” (Genesis 30:17).
“Jacob came from the field in the evening” – there we learned: One who hires laborers and stipulates with them to rise early and to continue late, in a place where they are accustomed not to rise early or to continue late, he is not permitted to compel them. Rabbi Muna said: In a place where there is no custom, it is a stipulation of the High Court that going out will be at the expense of the employer,⁵The laborer is not required to go to work until sunrise. and coming in will be at the expense of the laborer.⁶The laborer is required to work until dark.
Going out is at the expense of the employer, from where is it derived? “When the sun rises, they will gather” (Psalms 104:22). From then on: “A person goes out to his work” (Psalms 104:23). Coming in will be at the expense of the laborer, from where is it derived? “And to his labor until evening [adei erev]” (Psalms 104:23) – “ad erev” is not stated, but rather, “adei erev,” meaning until dark, just as it says: “until complete darkness [adei neshef]” (Job 7:4).⁷Erev can mean until sunset, and it can mean until it is dark. Neshef means when it is dark. A verbal analogy is being used to teach that the worker returns home when it is dark, and does not return home by sunset. Rabbi Ami said in the name of Reish Lakish: They imposed upon the employer that if it was the day before Shabbat, the coming in would be at his expense. To what extent? It is so each and every one would fill a barrel of water for himself and roast a fish for himself while it is still day, in deference to Shabbat, and to kindle a lamp, as it is stated: “Jacob came from the field in the evening.” That is what is written: “And to his labor until evening.”

“Leah went out to meet him” – it teaches that she did not allow him to wash his feet.⁸After coming in from labor in the field she did not allow him to go to his tent, which he shared with Rachel, to wash himself.
“And said: You will consort with me” – Rabbi Abahu said: The Holy One blessed be He saw that her intention was exclusively for the sake of Heaven, to produce tribes. That is why it was necessary for the verse to say: “God heeded Leah” (Genesis 30:17).
“And said: You will consort with me” – Rabbi Levi said: Come and see how pleasing the mediation of mandrakes was before the One who spoke and the world came into being, as, by means of the mandrakes, two great tribes in Israel were produced – Issachar and Zebulun. Issachar sits and engages in Torah study, Zebulun sets out to the seas and comes and provides for Issachar’s mouth, and the Torah proliferates in Israel – “the mandrakes emitted fragrance” (Song of Songs 7:14).⁹They emitted a pleasant fragrance before the Lord.
“Leah said: God has given me my reward, because I gave my maidservant to my husband. She called his name Issachar” (Genesis 30:18).
“Leah said: God has given me my reward [sekhari]…She called his name Issachar.” Issachar was the ninth of the tribes, but he brought his offering second to the king. That is what is written: “On the second day, Netanel ben Tzuar, prince of Issachar, presented his offering” (Numbers 7:18). Why was that? It is because he was a Torah personality. That is what is written: “From the children of Issachar, possessors of understanding of the times” (I Chronicles 12:33). What is “of the times”? Rabbi Tanḥuma said: Of the propitious time for everything. Rabbi Tanḥuma said: Of intercalations.¹⁰Intercalations of years and months
“Their leaders were two hundred, and all their brethren at their command” (I Chronicles 12:33) – Issachar would produce two hundred heads of the Sanhedrin, and all their brethren in accordance with them, and they all agreed to rule halakha in accordance with them, and he would answer them with halakha like a halakha transmitted to Moses at Sinai. From where did Issachar come to all this prominence? It was from Zebulun, who would engage in his commerce, and would feed Issachar, who was a Torah personality. That is what is written: “Zebulun will dwell at the shore of seas” (Genesis 49:13). When Moses came to bless the tribes, he had the blessing of Zebulun precede the blessing of Issachar: “Of Zebulun he said: Rejoice, Zebulun, in your departure, and, Issachar, in your tents” (Deuteronomy 33:18) – Rejoice, Zebulun, in your departure¹¹Departure on business trips. from the fact that Issachar is in your tents. Some say: There is reward [yesh sakhar] in the tents of Zebulun.