Some comments on “eat of my flesh and drink of my blood.” Jesus explained that the Word was his flesh, but he didn’t explain what the blood meant. The disciples knew from Genesis 9:4 But flesh with the life thereof, which is the blood thereof, shall ye not eat. 5 And surely your blood of your lives will I require; at the hand of every beast will I require it, and at the hand of man; at the hand of every man’s brother will I require the life of man. 6 Whoso sheddeth man’s blood, by man shall his blood be shed: for in the image of God made he man.
Jesus was clearly pointing to the future complete atonement on the Cross, but this was before the Cross, so how were they to get it? It did not make sense until fifty days after his death, burial and resurrection when the Holy Spirit came “like a mighty wind”.
Then it became clear that His flesh symbolizes the word of God and his blood symbolizes His sacrifice on the cross and saving us from all our sin.