I notice that of all of the people who claim to be Solascriptura (Bible-alone), I've never known of one that actually was. One very common unbiblical belief that is embraced by many who claim the Bible is their sole authority is the belief that Jesus was only speaking symbolically when he said his followers must eat his flesh and drink his blood.
John 6
This bread is my flesh, which I will give for the life of the world.”
52Then the Jews began to argue sharply among themselves,
“How can this man give us his flesh to eat?”
53 Jesus said to them, “Very truly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.
54Whoever eats my flesh and drinks my blood has eternal life, and I will raise them up at the last day.
55 For my flesh is real food and my blood is real drink.
56 Whoever eats my flesh and drinks my blood remains in me, and I in them.
57Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me.
58 This is the bread that came down from heaven. Your ancestors ate manna and died, but whoever feeds on this bread will live forever.”
59 He said this while teaching in the synagogue in Capernaum.
Many Disciples Desert Jesus
60 On hearing it, many of his disciples said, “This is a hard teaching. Who can accept it?”
61 Aware that his disciples were grumbling about this...
...65 He went on to say, “This is why I told you that no one can come to me unless the Father has enabled them.”
66 From this time many of his disciples turned back and no longer followed him.
So, this was the first time in Jesus ministry that he lost followers. It was over this teaching. He never called them back to explain that he was speaking symbolically.
In every last supper account he says "This is my body, this is my blood". Those are not the words of symbolism. In fact, for the next 1500 years, every Christian Church on the face of the earth believed it to be literal. It's hard to imagine Jesus would use words to lead Christians astray for 1500 years without ever offering an explanation that He was speaking symbolically.
Paul goes on to further explain Holy communion as being literally the body and blood of Christ.
The early Church leaders ("Church Fathers") clearly believed holy communion was literally the flesh and blood of Christ as well.