Actually it is Jesus in the BIBLE that teaches this: John 6:53 Jesus said to them, “Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you.
54 Whoever eats* my flesh and drinks my blood has eternal life, and I will raise him on the last day.
55 For my flesh is true food, and my blood is true drink.
Well said.