“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.”
John 6:53 — Greek Interlinear
Church Fathers on John 6:53
The Jews not understanding what was the bread of A peace, strove among themselves, saying, How can this man give us His flesh to eat? Whereas they who eat the bread strive not among themselves, for God makes them to dwell together in unity.
The Jews thought that our Lord would divide His flesh into pieces, and give it them to eat: and so mistaking Him, strove.
AS they thought it impossible that He should do as He said, i.e. give them His flesh to eat, He shows them that it was not only possible, but necessary: Then said Jesus to them, Verily, verily, I say to you, Except you eat the flesh of the Son of man, and drink His blood, you have no life in you.