Mikveh (sometimes spelled as mikvah, or either way without the ending -"h") (Hebrew: מִקְוֶה / מקווה, Modern Mikve Tiberian Miqwā; plural: mikva'ot or mikvesHebrew: מִקְוֶוֹת / מִקְוָאות) is a bath used for the purpose of ritual immersion in Judaism. The word "mikveh", as used in the Hebrew Bible, literally means a "collection" – generally, a collection of water.

Several biblical regulations specify that full immersion in water is required to regain ritual purity after ritually impure incidents have occurred. Most forms of impurity can be nullified through immersion in any natural collection of water. Some, such as a Zav, however require "living water," such as springs or groundwater wells. Living water has the further advantage of being able to purify even while flowing as opposed to rainwater which must be stationary in order to purify. The mikveh is designed to simplify this requirement, by providing a bathing facility that remains in ritual contact with a natural source of water.

Its main uses nowadays are:

Yitzchak Ginzburg (born 14 November 1944) is an American born Israeli rabbi. He is a follower of the Chabad Lubavich movement and currently Rosh Yeshivah of the Od Yosef Chai Yeshivah in the Settlement Yitzhar in the West Bank, and the leader of the kabbalistic Gal Einai organization. He has published numerous books. A charge of incitement to racism was dropped after he made a clarification statement.

Ginsburgh was born in St. Louis, Missouri in 1944. His father held a PhD in education and consulted for various Jewish organizations.

While living in Philadelphia, he met a descendant of the Nadvorna Chassidic dynasty and at the age of 14 became a baal teshuva. He attended the University of Chicago majoring in mathematics and philosophy. He then completed a Masters in Mathematics at the Belfer Graduate School of Yeshiva University. At the age of 22, he decided to devote himself entirely to Torah study.

In 1965 he went to Israel and studied at the Yeshivah of Kamenitz in Jerusalem. He spent 1966 through 1967 at the Slonim shul in Tiberias. After the Six Day War, Ginsburgh went to Jerusalem, and was one of the first to move into the old Jewish quarter. He started to study the Chabad school of Chassidus in depth. That year he visited the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, and remained in Crown Heights, Brooklyn for several months. When he returned to Israel he married, and began to teach Talmud, Shulchan Aruch, and Chassidut to a group of students in Jerusalem.