Tzitz Eliezer: Orthodox Responsa from Rabbi Eliezer Waldenberg (1919-2006)
In his large collection of responsa on Jewish law called Tzitz Eliezer, Rabbi Waldenberg (who served on Israel's supreme rabbinical courts) addressed some specifics regarding transgender people and halachah, the last of which is considered a particularly important and controversial statement.
I also saw in a book called Yosef Et Achiv (by Rav Yossi Plaggi, z”l), (3:5) that asks… if there’s a case of a woman who led a normal life for years and then became a man, does he need a get [divorce document] because when he got married she was a woman, or is there no get because he isn’t a woman? … It seems to me in this question that there is no need for a get because he’s a man and not a woman.
And as I said, as for a man like this—who was a woman who changed to a man—when he says morning blessings, he does not say, “who did not make me a woman,” because although he came out of his mother’s womb and into the world as a woman, he should say, “Blessed are You, Lord our G-d, Ruler of the Universe, who has changed me into a man.”
The identity and birthright of a human is not expressed by the separate organ parts of his body—and this will be the most important—but by the spirit and the soul which are within them. The Chatam Sofer got it right when he wrote that the body is not the human; rather the body is a bag made of dust and within that bag is inner wisdom, knowledge, and thoughts, which are the true definitions of personality.