Mikvah is the Hebrew word for a gathering. The same root, קוה, gives us Genesis 1:10's mikveh hamayim, the gathering of the waters that HaShem called seas. By the late Second Temple period the word names a particular kind of gathering: a body of water that meets halakhic requirements for ritual immersion. The water must be mayim chayim, living water, fed by spring, river, sea, or rain. Stagnant water alone does not qualify. The mikvah is alive in the Hebrew imagination because the water in it has touched the natural world, the world HaShem made, before it touched the body.

KJV, ESV, NASB, and NIV do not translate the word. They do not have to: it does not appear in the Greek New Testament. What the New Testament has instead is βαπτίζω, baptizō, which is what a Greek-speaking Jew of the first century called the act of stepping into a mikvah. The translators of every English Bible kept the Greek transliteration baptize and lost the Hebrew location it pointed to. Generations of English readers have heard the word baptism without ever hearing mikvah, and the substrate has been ignored ever since.

A mikvah is not a sacred font. It is not a baptistery. It is not the priest's hand or the formula or the moment. It is the water, and the water is alive, and the body steps in.