Leah's Pure Intent and the Pact of Issachar and Zebulun

"And Leah went out to meet him" - this teaches that she did not even let him wash his feet. "And she said, You must come in to me." The Holy One, blessed be He, foresaw that her intention was only to raise up tribes; therefore Scripture had to say "You must come in to me." "And I will purge out from among you the rebels" (Ezekiel 20:38) - these are the children of nine kinds: children conceived in fear, in compulsion, and so on. But are children of a brazen woman truly excluded? Did not Rav Shmuel bar Nachman say in the name of Rav Yonatan: any man whose wife demands him will have children such that even in the generation of Moses our teacher there were none like them, as it is said, "Get for yourselves men wise and understanding" (Deuteronomy 1:13), and it is written, "And I took the heads of your tribes" (Deuteronomy 1:15), and it is written, "Issachar is a strong-boned donkey" (Genesis 49:14), and it is written, "And of the children of Issachar, men who had understanding of the times" (1 Chronicles 12:33)? That case is where she coaxes him gently. Rabbi Levi said: come and see the power of the mandrakes, for through the mandrakes two great tribes arose in Israel, Issachar and Zebulun. Issachar sits and occupies himself with Torah, and Zebulun goes out and sails the seas and puts food into the mouth of Issachar, and Torah increases in Israel. This is what is written, "The mandrakes have given forth fragrance" (Song of Songs 7:14). "And she said, You must come in to me." (This is written at remez 31.)