Jacob Knows!

The story of Yehuda and Tamar is a very strange juxtaposition to the kidnap and sale of Joseph. Many reasons are given, but I'd like to add more.

Joseph was 17 when he was sold, by his brothers to the Ishmaelites who traded with Midianites on their caravan journey to the house of Potiphar in Egypt. 

Genesis 37:25

(25) Then they (the brothers) sat down to a meal. Looking up, they saw a caravan of Ishmaelites coming from Gilead, their camels bearing gum, balm, and ladanum to be taken to Egypt.

כה) וַיֵּשְׁבוּ֮ לֶֽאֱכָל־לֶחֶם֒ וַיִּשְׂא֤וּ עֵֽינֵיהֶם֙ וַיִּרְא֔וּ וְהִנֵּה֙ אֹרְחַ֣ת יִשְׁמְעֵאלִ֔ים בָּאָ֖ה מִגִּלְעָ֑ד וּגְמַלֵּיהֶ֣ם נֹֽשְׂאִ֗ים נְכֹאת֙ וּצְרִ֣י וָלֹ֔ט הוֹלְכִ֖ים לְהוֹרִ֥יד מִצְרָֽיְמָה׃

Commentators raise the oddity of the Ishmaelite load, which would normally have been tars, not the fine balm's mentioned. A Yemenite midrashic source backs up my view that Torah is hinting at something very special.

The Ishmaelite caravan was trading with a Midianite caravan, traveling through Gilead as they separately journeyed to Egypt. The gum, balm and ladanum (נְכֹאת֙ וּצְרִ֣י וָלֹ֔ט - sweet smelling balm's) were a hint that Joseph's niece Aesnath (אסנת) who, 9 years earlier Jacob had placed in a 'sneh' (סנה), a bush in Midyan (perhaps Mount Sinai - סיניה) was traveling on the same caravan. Sneh is in fact the source of her name. Ultimately Joseph and Aesnath were traded into the House of Potiphar in Egypt.

However, the story of their journey is interjected and juxtaposed to the story about the death of Yehuda's two sons that led him to a relationship with is daughter in law, Tamar who birthed Peretz. Then oddly, immediately after the interjection, Torah returns to Joseph (of Rachel) who at 30 years was blessed by Pharaoh to marry Aesnath (from Dinah-Leah). This was the first time the bloodline of Jacob's two wives intermarried. 

Mystical Judaism introduces the idea that the Messianic son of Joseph will precede the Messianic son of Yehuda (David). That seems to be borne out of and supported by Joseph and Aesnath, on the same Caravan being interjected by and adjacent to Yehuda and Tamar (read the link for more about the Messianic soul).  

Later in the story, Joseph encountered his brothers and demanded they fetch the youngest brother  Binyamin from their father Jacob and bring him to Egypt. Reluctantly Jacob conceded, but he commanded his sons to return baring gifts of the land.

Genesis 43:11

(11) Then their father Israel said to them, “If it must be so, do this: take some of the choice products of the land in your baggage, and carry them down as a gift for the man—some balm and some honey, gum, ladanum, pistachio nuts, and almonds.

יא) וַיֹּ֨אמֶר אֲלֵהֶ֜ם יִשְׂרָאֵ֣ל אֲבִיהֶ֗ם אִם־כֵּ֣ן ׀ אֵפוֹא֮ זֹ֣את עֲשׂוּ֒ קְח֞וּ מִזִּמְרַ֤ת הָאָ֙רֶץ֙ בִּכְלֵיכֶ֔ם וְהוֹרִ֥ידוּ לָאִ֖ישׁ מִנְחָ֑ה מְעַ֤ט צֳרִי֙ וּמְעַ֣ט דְּבַ֔שׁ נְכֹ֣את וָלֹ֔ט בָּטְנִ֖ים וּשְׁקֵדִֽים׃

Three of the six gifts connect to the land, Honey (from dates), Pistachio and Almonds, but the remaining three are identical to and directly relate to the fine balm load carried by the Ishmaelites. Was Jacob hinting at something by sending these three specific gifts to Joseph? By Jacob connecting his gift to Aesnath he was hinting that he knew of her dispatch on the Midianite caravan to Egypt. 

The lofty, mystical pieces of this deeply spiritual world begin to be seen by us mortals. Jacob dispatched Aesnath and sent Joseph to find his brothers, the angel of Dothan delivered him into their hands. Torah juxtaposed the important event of Yehuda and Tamar. Jacob ultimately sent all his sons to Egypt and later the family of Israel immigrated. On Jacob's death bed, he anxiously wanted to tell them of the messianic roots he had set, but in unison his sons settled him saying "Hear O' Israel (as in Jacob) the Lord is God, the Lord is One" to which he responded "Blessed be the name of the glory of His Kingdom for ever and ever" then he left this world.