God has kept blood as a visible sign.
This is seen from the way the Israelites were protected at the time of the Exodus. The blood of the Passover Lamb (identified as Jesus Christ in the New Testament) was put on the sides and the tops of the doorframes of the houses of the Israelites. And the people were asked to be within the house.
That meant they were under the protection of that blood. God said: “The blood will be a sign for you . . . When I see the blood, I will pass over you. No destructive plague will touch you . . . .” Likewise, the blood that flowed from the body of Jesus on the Cross of Calvary is a visible sign.
Again, God has kept blood as an applied sign.
In the Old Testament blood was sprinkled on the people when they entered into a covenant (agreement) with God. Blood was also applied to the lobes of the right ears, the thumb of the right hands and the big toes of the right foot of the priests. The priests were people who drew nearest to God in His tabernacle or temple. They could only do so by applying blood on their bodies.
Similarly, mere knowledge of the blood of Jesus is not enough. Instead you have to apply it to your life if you want to approach God through that new and living way Jesus opened for you through His precious blood. Such an application of the blood of the Lamb helps you overcome Satan your accuser.
Again, blood is a remembered sign.
Jesus when He ate the Supper with His disciples before His death said: “This cup is the new covenant in my blood; do this, whenever you drink it, in remembrance of me.” So Jesus wants us to remember Him for His broken body and shed blood on the cross.
A Christian should have a remembrance of the blood of Jesus whenever he or she thinks of Him. This remembrance is the distinguishing mark of a true disciple of Jesus.
Blood is a sign of cleansing and forgiveness.
In the Old Testament times people who were cleansed of infectious skin diseases were sprinkled with blood. In a marvelous great promise Prophet Zechariah talked about a fountain to be opened to the house of David to cleanse them from sin and impurity. The New Testament clearly identifies this fountain with the blood of Jesus.
The Bible says that without shedding of blood there is no forgiveness. But it also pointed out that it is impossible for the blood of bulls and goats to take away sin. But Jesus’ blood cleanses our consciences from acts that lead to death and also purifies us from all sin.
Blood is an everlasting sign of praise too.
John begins the Book of Revelation singing praise to Jesus saying: “To him who loves us and has freed us from our sins by his blood . . . .” As Revelation unfolds John sees a Lamb, looking as if it had been slain in the center of the throne in heaven.
He hears a song praising the Lamb saying He is worthy because He was slain and with His blood purchased men for God from every tribe and language and people and nation! So the language of worship in heaven will echo with praise of Jesus’ blood throughout all eternity! Oh, precious blood of the Lamb!
Read more on the precious blood of Jesus:The Blood of Jesus Christ: What does it mean to you today?