And later on in that same chapter:
The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat? 53 Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. 54 Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. 55 For my flesh is meat indeed, and my blood is drink indeed. 56 He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him. 57 As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me. 58 This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever. |
Let the reader decide. This is about the Eucharist.
And John, remember, wrote his Gospel account after Peter died, so this is written in the late 60s soonest. The Church was more 30 years old, and so when John takes pains to introduce something new from the Apostolic witness, and commit it to writing, there is an answer to our question, 'Why?'
In this case, as the 'Didache' indicates, there must have been some doubt over whether Holy Communion was literally the Lord's body and blood. John wrote chapter 6 to address this doubt, sharing with us a new account, something else that had happened during His earthly ministry, His feeding of the 5000, followed by His exposition on the then future Eucharist.
The other Gospels didn't have this, they just quoted Jesus as saying, 'This is My body,' and, 'This is My blood,' and left it at that.
Indeed.