Chassidic master Rabbi Dovid Biederman of Lelov (1746-1814) was a disciple of
the "Seer of Lublin."
Rabbi Dovid was known for his extraordinary ahavat
yisrael; it was said of him that he was literally incapable of seeing faults
in a fellow Jew. Two printed collections of stories about him are Migdal
David and Kodesh Hillulim.
Rabbi Dovid's main disciple was Rabbi Yitzchak of Vorki, whose son, Yaakov
David, founded the Amshinover dynasty of chassidic rebbes.
Once a month, as the moon waxes in the sky, we recite a special blessing called Kiddush Levanah, "the sanctification of the moon," praising the Creator for His wondrous work we call astronomy.
Kiddush Levanah is recited after nightfall, usually on Saturday night. The blessing is concluded with songs and dancing, because our nation is likened to the moon—as it waxes and wanes, so have we throughout history. When we bless the moon, we renew our trust that very soon, the light of G‑d's presence will fill all the earth and our people will be redeemed from exile.
Though Kiddush Levanah can be recited as early as three days after the moon's rebirth, the kabbalah tells us it is best to wait a full week, till the seventh of the month. Once 15 days have passed, the moon begins to wane once more and the season for saying the blessing has passed.