Asher Zebi ben David of Ostrowo was a 19th-century hasidic rabbi who served as Av Beit Din of Korets, Volhynia, and later as "maggid" (preacher) of Ostrowo, in the government of Lomza in Russian Poland.
He was a pupil of Rabbi Dov Ber of Mezeritch.
[1][2] Asher is the author of "Ma'ayn haḤokmah" (Spring of Wisdom), Korets, 1817, containing kabbalistic homilies on the Torah and other books of the Hebrew Bible.
[1][3] Eliezer Zweifel in his work in defense of Hasidism ("Shalom al-Yisrael," pp.
81, 82) quotes aphorisms from this work; one of which shows Asher's contempt for those who study the laws of nature or secular science.