We do know that the result of the relationship between Tamar and Yehuda resulted in the lineage of the Moshiach. This is explained in this article :
http://www.tzemachdovid.org/rabbikret/vayeishev_01.htmlYehuda, Tamar and MoshiachThe Torah in Parashas Vayeishev relates the story of the relationship between Yehudah, and his daughter-in-law Tamar. According to the Sages, at the time when Yehudah and Tamar were having relations, G-d was involved with "the light of the Moshiach" (i.e. the messiah) - who would rise from the household of David, stemming from the relationship between Yehudah and Tamar.
How strange! Was it not possible for G-d to bring about the Moshiach through a normal relationship? Why did G-d choose this abnormal and "illicit" relationship as the heritage from which the savior of Israel would eventually come to be? Why not a nice regular yiddishe wedding, with dancing and celebration?
Perhaps this scenario would be more understandable if we realize that G-d operates using the rules of Middah Knegged Middah (a measure for a measure). This means that G-d causes certain events to happen as payback for a person's previous actions. Yehudah was the one who had saved his brother Yosef from the other brothers by telling them to sell him to the Ishmaelites, rather than letting him die in the pit into which they had thrown him. Yosef would eventually end up in Egypt, and his stay would culminate with the enslavement of our people, the Exodus, and the receiving of the Torah at Sinai.
This action on the part of Yehudah eventually resulted in the most significant event in our history. G-d wanted to reward Yehudah for this action measure for measure. Yehudah, however, had no idea that his actions on behalf of Yosef would ever lead to those events. Thus, his reward for that act needed also to come about in such a way, that he would have no idea what would emerge. Moshiach, who represents all that is holy, would be the last person Yehudah would have expected to emerge from his illicit union with Tamar. This was G-d's way of paying Yehudah back measure for measure.
http://www.torah.org/learning/perceptions/5758/vayeishev.htmlParshas Vayeishev
Dreaming of Reality
By Rabbi Pinchas WinstonThis is the parsha during which everything breaks loose. As if going back on their word (and destroying Shechem in the process) wasn't enough, Ya'akov's sons saw fit to sell Yosef into slavery and plunge their father into 22 years of mourning. And in the midst of all of this, Yehuda unwittingly became the father of the Moshiach by "accidentally" taking his past daughter-in-law, Tamar, as a wife. There's certainly what to talk about in this week's parsha!
The following midrash provides a brief summation:
The tribes were involved with the sale of Yosef; Yosef was immersed in mournful thoughts about his separation from his father; Reuven was involved with mourning over his sin; Ya'akov was mourning for Yosef; Yehuda was busy taking a wife for himself (Tamar). And the Holy One, Blessed is He, was busy creating the light of Moshiach. (Bereishis Rabbah 85:2)
From this midrash, it seems that everyone was acting out the fulfillment of a master plan they knew about, but yet, were unaware of. But make no mistake about it-every detail, the good ones and the bad ones, were pieces in a puzzle that envisioned a glorious redemption and fulfillment of creation.
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http://www.shemayisrael.com/parsha/orchards/archives/vayeshev60.htm.
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In this weeks parsha their are 2 other “wents”. "Yoseph went down..." and "Yehudah went down..." These are also preparations of events for the final days. Yoseph went to establish the Mashiach ben Yoseph, who will fight and pave the way for the Mashiach ben David. Yehudah is taking care of Mashiach ben David. Lot was the forefather of Ruth, the mother of the House of David. The father’s side descends from Yehudah and Tamar.
Yehudah has two older sons and one younger. Now when one is destined to give birth to the Messianic line, the beginning of the end for the Yetser Horah, you can be sure the Yetser Horah is there to stop it. In fact, he succeeded twice. Tamar married Yehudah's firstson who ended up dead for succumbing to the Yetser horah. He died childless. Yehudah tells his 2nd son to perform yiboom. This is when a brother marries the deceased's wife and their child will be a continuation for the deceased. A second chance of sorts. The brother marries Tamar. He also succumbs and dies childless. Yehudah's 3rd son is too young for marriage. Yehudah tells Tamar to "Remain a widow till he is old enough." The Torah reveals to us Yehudah's doubt as to whether he will let his third son marry Tamar.
Tamar waits. Yehudah's wife dies. The youngest son grows up. He is not being given to her. Tamar has to go right to the source of the Messianic line, Yehudah. She hears Yehudah is on a road trip. She dresses like a harlot and waits for him. We know to ask how Yehudah, the man whom G-d deems worthy of fathering the Royal house of David and the Messiah, would consort with a harlot?!?! Excellent question! Put it on hold. Yehudah approaches her. She takes from him his signet, wrap and staff.
Three months later, Tamar whose back at home 'waiting' for Yehudah's youngest is beginning to show. She's carrying twins. It is told to Yehudah. Yehudah judges the punishment for her promiscuity is to burn her at the stake. As they are lighting the fire under her she says to deliver a package to Yehudah which is the property of the man who impregnated her. Yehudah opens the package and says, "She is right. I did it." Tamar and the twins are saved.
Rav Wolfson asks, what's with the dramatics? Why didn't Tamar tell Yehudah it was her after the affair? Or after the sentencing? Or as they were tying her up? Why did she wait until the fire was already at her feet before speaking up? Wait, she didn't speak up! She chose for Yehudah to speak up or she would die with her twins!?! She knows she has kings of Israel in her stomach and she puts all their fate in Yehudah's hands??
We mentioned the concept of self sacrifice, M’sirus Nefesh. No one has a problem with, "Nothing in life is free." This is synonymous with, " You get what you pay for." Everyone heard grampa say at least once, "Listen sonny, I worked for my money!" These are all the most basic forms of m'sirus nefesh. In Judaism, if you want something (whatever it is), if you want it to count, to work, to last, then you have got to give of yourself to get it. It’s just that we Jews want it all. We want it to count forever. We want it to mean something to Hashem and to work for all future generations, to last on into the world to come. Do you think Grandpa would have worked a little harder for that?
It is unbelievable kindness Hashem did for us by giving us m'sirus nefesh as a metaphysically functioning aspect of nature. "G-d, what about my family? My grandchildren?? What's going to be? Could I possibly do anything for my great grandchildren? My community?? My people???" Hashem set it up so we could do something. It will cost but it will be worth it.
Tamar knows m'sirus nefesh. She knows what kind of genes are needy for the monarchy and Mashiach. If Yehudah doesn’t have it, forget it. She sets up the biggest pressure cooker in history. Imagine yourself sitting in front of...EVERYONE! The woman YOU sentenced is being lit, right now. You are given a package. You have a 1/2 second to either embarrass yourself in front of everyone that you were not only wrong but the guilty party OR in another half second all the embarrassment will go up in smoke and you could go on with your life. The first moment is when the survival instincts kick in. The " I should do the right thing" thoughts come next. Tamar did not give Yehudah any 'next'. Yehuda's first reaction has to be the right reaction. Truth, including all the embarrassment. Only the lion, Yehudah could, in a heart beat, say "She is right. I did not give her my son." The Sages say that it was a voice from heaven that said, "I did it." Yehudah would never consort with a harlot so Hashem forced the situation. The m'sirus nefesh of Tamar and Yehudah earned Israel our kings and, soon to arrive, our Mashiach.
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There is much more on this topic...