It was common that during a worship service at the synagog that a Rabbi, such as Jesus, would be invited to teach after what is called the “Torah Service”. According to v. 59, this teaching happened at Capernaum.
During the Torah Service on a triennial cycle a “parsha” would be read. On this day they may have read Parashat Beshalach (Exodus 13:17-17:16), which includes the manna account of Exodus 16, for that parsha would have been scheduled between Passover and the later festivals. So, so during the period in which this event fell.
(Additionally, it is curious the during the three-year Jesus ministry the Torah cycle would have been read in its entirety.)
He begins by explaining that by teaching them that He was fulfilling the prophecy of Isaiah 54:13. That He was God the Teacher!
It is written in the Prophets, ‘And they will all be taught by God.’ Everyone who has heard and learned from the Father comes to me—
And that, for some, His teaching would draw them. But what He taught was truly a "hard saying" (v. 60).
I am the bread of life. Your fathers ate the manna in the wilderness, and they died. This is the bread that comes down from heaven, so that one may eat of it and not die. I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. And the bread that I will give for the life of the world is my flesh.”
That to live eternally would require them to eat Him spiritually. This is one of the seven “I am” Statements in John.
Then by switching to “feeds” (trōgō) at v. 54, this passage (John 6:41-71) describes it as the on-going dependence on Jesus Christ. It is not simply an initial taste (Psalm 34:8), nor just the periodic sacrament, but he is our daily sustenance.
When you read the Lord’s prayer, something stands out. All the rest of the prayer concerns spiritual matters, except for its central petition “Give us this day our daily bread” (Matthew 6:11).
When a text like this rotates around a central phrase, the style is called chiasmus or a ring construction. (The Psalmist also wrote in this style. For example, “for you are with me” is central to Psalm 23).
Many Early Church Fathers wrote of the chiastic centrality of this petition in not simply a physical sense but also spiritual (St. Cyprian of Carthage (c. 252 AD) in his Treatise on the Lord’s Prayer; Origen (c. 185–253 AD) in On Prayer (chapter 27); St. Augustine (354–430 AD) in his sermons on the Lord’s Prayer; and St. John Chrysostom).
Jesus Christ is the answer to this petition, or as Luke records Jesus when he taught the prayer a second time “Give us each day our daily bread” (Luke 11:3).
The word translated “daily” (epiousios) is unique to these two verses. They are not simply the only two places in all of scripture where this is used, the word is not used anywhere else in all of ancient Greek literature. This word is important.
Luke’s account already has “each day” (kata hēmōn), which is already regularly translated 18 other times as “daily”. So, epiousios must mean something more than simply “daily”. Without a point of comparison, it is difficult, but many scholars think it means the sustenance necessary for the coming day and echoes a bookend verse from the Sermon on the Mount:
“Therefore do not be anxious about tomorrow, for tomorrow will be anxious for itself. Sufficient for the day is its own trouble.
There are multiple accounts from the Nazi concentration camps that key to survival was saving a portion of your ration for the next day (See for example the account of Eva (Gryka) Kohan and her sister at Auschwitz). This petition then is for that portion.
But when manna, the original bread from heaven, was given, it was collected daily and used that day. None could be saved for the next day or it would go bad (Exodus 16:19-20).
That is, except for the day before the Sabbath.
Jesus Christ is that double-portion, our epiousios. And not simply for today, but for the eternal Sabbath that we await and for which we need not be anxious.On the sixth day they gathered twice as much bread, two omers each. And when all the leaders of the congregation came and told Moses, he said to them, “This is what the Lord has commanded: ‘Tomorrow is a day of solemn rest, a holy Sabbath to the Lord; bake what you will bake and boil what you will boil, and all that is left over lay aside to be kept till the morning.’” So they laid it aside till the morning, as Moses commanded them, and it did not stink, and there were no worms in it. Moses said, “Eat it today, for today is a Sabbath to the Lord; today you will not find it in the field.