Letter of Approbation and Recommendation Handwritten and Signed by the Chiddushei HaRim, First Rebbe of Ger

Letter (approx. 6 lines) handwritten and signed by R. Yitzchak Meir Alter author of Chiddushei HaRim. Warsaw, 1857.
Recommendation and approbation for a composition on Midrash Rabba Bereshit, by R. Moshe Zalman (the composition was presumably never published). The Chiddushei HaRim commends the composition which refutes the Maskilim's deprecation of Midrashim:
"And behold, prominent rabbis laud R. Moshe Zalman N.G. (?), and the benefit he has caused with his composition on Midrash Rabba Bereshit, and he rebuts those who defame Midrashim, therefore it is fitting to draw him close, to be of assistance to him, to buy this composition. Here, Warsaw, Thursday, first day of Rosh Chodesh Elul 1857. Yitzchak Meir son of R. Y.".
R. Yitzchak Meir Alter, first Rebbe of Ger, author of Chiddushei HaRim (1799-1866, Encyclopedia L'Chassidut, II, pp. 413-423), a foremost scholar in Torah and Chassidism in his times and a leader of Polish Jewry. He was born following the blessing of the Maggid of Kozhnitz (who foretold that he would "illuminate the world with Torah"), and was nurtured and raised in his home, becoming his close disciple. At the age of 13, he moved to his father-in-law's house in Warsaw, where he learned under R. Aryeh Leib Zuenz and gained fame throughout Poland as "the genius from Warsaw". After the passing of the Maggid of Kozhnitz, he became one of the foremost disciples of R. Simcha Bunim of Peshischa. With the latter's demise, a number of Chassidim wished to appoint him as successor, but R. Yitzchak Meir gave deference to R. Menachem Mendel of Kotzk, influencing most of the Chassidim to follow the Rebbe of Kotzk. He became the most outstanding figure in the Kotzker court, eventually becoming the Rebbe's brother-in-law when he married the latter's sister-in-law. In 1859, R. Yitzchak Meir was appointed the Kotzker Rebbe's successor and moved to nearby Gur (Góra Kalwaria), where he served as rabbi and established the Ger Chassidic court. During his seven-year tenure, his court flourished and thousands became his followers. Besides for his exceptional piety, he was venerated as an outstanding Torah scholar and wrote many responsa on Halacha and Aggadah named Chiddushei HaRim (acronym of R. Yitzchak Meir), a title he became known by. His books are highly acclaimed and expose his sharpness and exceptional Torah proficiency. He maintained close ties with all the leading Torah scholars of his times, including those who opposed Chassidism. Among them were R. Yisrael of Ruzhin, R. Yitzchak of Warka, R. Akiva Eiger, R. Yaakov of Lissa (Leszno) the author of Netivot, R. Izel Charif, R. Shlomo Kluger and others. He stood at the helm of Polish Jewry and took a firm stance on many communal matters. He publicly supported the Polish revolution in 1830, and after it failed, was forced to flee to Lviv (which was at the time under Austrian rule). He was also known for his valiant struggle against the Dress Decree in 1846-1851. Following his orders to resist the decree, he was imprisoned but wide public protest compelled the government to release him and abolish the decree. After his death, R. Chanoch Heinich HaKohen of Alexander succeeded him for a short while, and with his passing four years later, a grandson of the Chiddushei Harim, R. Yehuda Aryeh Leib Alter, author of Sfat Emet was appointed the second rebbe of the Ger dynasty.
[1] leaf. 21 cm. Good condition. Stains and folding marks. Reinforced with a small piece of tape on verso.