The Jewish ritual of Mikvah goes back to the time when God brought the children of Israel through the waters of the Red Sea, as He delivered them from Pharaoh and his host. This took place immediately after the first Passover, when the blood of the lamb was applied to the door post of every Israelite home.
As God led them though the water, Israel as a nation, became baptized unto a whole new way of life. God not only delivered them from a former life of oppression, slavery and bondage, but He also established them as a holy nation, as He let them toward the promised land.
As believers in the Messiah Yeshua, God has done the same for us through the blood of His Son, the Lamb of God who died for our sins on Passover. We have been set free from a former life of bondage, slavery and sin. We observe the ceremony of Mikvah as being baptized unto a whole new way of life in the Messiah, to be a holy nation as God leads us toward the Kingdom of heaven.
Romans 6:3&4 says: "Don't you know that all of us who were baptized into the Messiah Yeshua were baptized into His death? We were therefore buried with Him through baptism into death in order that just as Messiah was raised from the dead through the glory of the Father, we too may live a new life."
The following blessings may be used at a Messianic Jewish Mikvah service:
Baruch atah adonai elohayne melech ha'olam asher kid'shanu b'mitzvotav v'tzivanu al hatvilah. "Deserving of praise are you, O Lord our God, Ruler of the universe who set us apart by His commandments and commanded us concerning the immersion."
Ah-nee mat'beel ot'cha b'shem Ha-Av, v'Yeshua, v'Ruach Ha Kodesh. "I immerse you in the name of the Father, the Son and the Holy Spirit."