The doctrine of baptism is one such thing. What does the Bible teach about baptism? Perhaps not what we think. Baptism has a long tradition, including among the Jews, who ritually washed themselves. The practice of water baptism continued into the church as a ordinance or sacrament of the faith. Importantly, the idea of being washed in both blood and water has both natural and spiritual implications.
So, I'm going to explore some of the ideas surrounding baptism. This is by no means a thorough exposition, nor is it necessarily scholarly. I am not a Bible scholar.
The Old Testament
We well know that the offering of blood for the remission of sins is a crucial part of Jewish understanding. Large portions of the O.T. are instructions and references to blood sacrifice. All of this, of course, was pointing to the ultimate sacrifice for sin, given once for all in the person of Jesus Christ. But not as clear to me was how baptism connects to this.
The earliest biblical mention I could find regarding something akin to baptism is Num. 19:20-21:
"But if a person who is unclean does not purify himself, he must be cut off from the community, because he has defiled the sanctuary of the LORD. The water of cleansing has not been sprinkled on him, and he is unclean. This is a lasting ordinance for them. The man who sprinkles the water of cleansing must also wash his clothes, and anyone who touches the water of cleansing will be unclean till evening."Like the blood sacrifices, this "water of cleansing" was a carefully described ritual act. Someone who was not clean could not enter the Temple to worship, and was actually an outcast, not part of the people. Of course, such a person could be restored to the community by becoming ceremonially clean, but until then they were unfit for worship and unfit to be part of the people.
David's famous statement in Ps. 51:7, "Cleanse me with hyssop, and I shall be clean; wash me, and I shall be whiter than snow" ties in here as well. Hyssop was used to place blood on the doorframe so as to be passed over. Moses sprinkled the people with blood at the giving of the commandments. Hyssop also was used to sprinkle water for ceremonial cleanness. Nu. 19:18: "Then a man who is ceremonially clean is to take some hyssop, dip it in the water and sprinkle the tent and all the furnishings and the people who were there."
And as an interesting aside, a hyssop branch was what carried the sponge with sour wine to Jesus' lips as He hung on the cross.
This "sprinkling,"is a physical representation of the spiritual cleansing God intends. The Messiah, the Lamb of God, is offered for the sins of the world, and His blood washes those who are unclean because of sin. That sin prevented us from coming in worship, and also separated us from the Body of Christ. What is particular to the Jews in a physical manifestation is a picture of what God intends for all men, both Jew and Gentile. Is. 52:15:
"... so will he sprinkle many nations, so will many nations marvel at him and kings will shut their mouths because of him. For what they were not told, they will see, and what they have not heard, they will understand."I like that this shown as a revelation, that those with spiritual eyes and ears will discern the glory of God as He offers His son as one sacrifice for all.
Ez. 36:25-27 continues this theme:
"I will sprinkle clean water on you, and you will be clean; I will cleanse you from all your impurities and from all your idols. I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh. And I will put my Spirit in you and move you to follow my decrees and be careful to keep my laws."This is a greater act than ritual cleansing, it's a change in the inner man, where we receive a tender heart and a new spirit. This washing is supernatural, transformative, and it is so thorough and efficacious that God's own Spirit can take up residence in us. Now we can truly keep the law, be worshipers in Spirit and truth, and take our place in the Body as one of the living stones. That law, the law of Christ, is grace imparted to us, not by virtue of how well we clean ourselves, but by how completely we have been washed by the blood of Jesus and thence filled by His Holy Spirit.