Why Immerse in the Mikveh?
Immersion in the mikveh (sometimes pronounced mikvah) actualizes the transition between the convert's old identity and his or her new one as a Jew.
Water Symbolizes Birth as a Jew
Submerging in a pool of water for the purpose not of using the water's physical cleansing properties but expressly to symbolize a change-of-soul is a statement at once deeply spiritual and immensely compelling. No other symbolic act can so totally embrace a person as being submerged in water, which must touch and cover every lesion, every strand of hair, every birthmark. No other religious act is so freighted with meaning as this one which touches every aspect of life and proclaims a total commitment to a new idea and a new way of life as it swallows up the old and gives birth to the new.
The water of the mikveh is designed to ritually cleanse a person from deeds of the past. The convert is considered by Jewish law to be like a newborn child. By spiritually cleansing the convert, the mikveh water prepares him or her to confront God, life, and people with a fresh spirit and new eyes--it washes away the past, leaving only the future. Of course, this does not deny that there were good and beautiful aspects of the past. But, in the strictest religious sense, that past was only prologue to a future life as a Jew.
There is a second layer of meaning to mikveh. It marks the beginning of the ascent to an elevated religious state. This function of mikveh goes beyond the basic purpose of purification. Anthropologists refer to this threshold of higher social status as "liminality." The person at this moment of transition is a "liminal" or "threshold" person. The liminal state is common to virtually all persons and societies, ancient and modern, and it marks a move to an altered status or to a life transition. Entering adulthood from adolescence, for example, requires a tunnel of time, a rite of passage, a liminal state that acknowledges by symbolic acts the stark changes taking place in one's self-identity, behavior, and attitude.
In a sense, it is nothing short of the spiritual drama of death and rebirth cast onto the canvas of the convert's soul. Submerging into waters over her head, she enters into an environment in which she cannot breathe and cannot live for more than moments. It is the death of all that has gone before. As she emerges from the gagging waters into the clear air, she begins to breathe anew and live anew--as a baby struggling to be born.
If we take this graphic metaphor a step further, we can sense that the mikveh is a spiritual womb. The human fetus is surrounded by water. It does not yet live. The water breaks in a split second and the child emerges into a new world. "As soon as the convert immerses and emerges, he is a Jew in every respect" (Yevamot 47b).
What is a Mikveh, Halakhically?
The mikveh must comply with a number of precise halakhic [Jewish legal] qualifications. The mikveh must be built into the ground or the structure of the building. It must hold a minimum of 24 cubic feet of water--200 gallons. The depth must be such as to enable an average adult to stand upright and have the water reach at least 11 inches above the waist, so that immersion can be performed without backbreaking contortions.
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