The beloved disciple, John, the last of the New Testament
writers, wrote his Gospel in the 90s. John was an eyewitness
to the events of the Last Supper
(John 6:30-68).
John 6:53-56
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. Whoever eats my flesh
and drinks my blood has eternal life, and I will raise
him
on the last day. For my flesh is true food, and my blood
is true drink. Whoever eats my flesh and drinks my blood
remains in me and I in him."
.