When they were filled, he said unto his disciples,
Gather up the fragments that remain, that nothing be lost.
Read Chapter 6
Cyril of Alexandria
AD 444
To some one Christ may seem out of sparing of the fragments to have bidden His disciples to gather them together. Yet (I think) every one will fitly imagine, that Christ would not endure to descend to such littleness: and why say I Christ? not even one of us would do so: for what would be supposed to be the remnant of five barley loaves? But the verse has a great economy, and makes the miracle evident to the hearers. For so great is the efficacy of God-befitting Authority in this matter, that not only was so great a multitude sated from five barley loaves and two little fishes, but twelve baskets full of fragments were gathered besides. Moreover the miracle repelled another (as is like) suspicion, and by the finding of the fragments confirmed the belief of there having been really and truly an abundance of food, and not rather the appearance of a vision deceiving both the eye of the feasters and of those who minister to them. But greater yet and more noteworthy, and of exceeding profit...
To make the miracle still more conspicuous to the multitude, Jesus Christ shewed, that not only their present wants were supplied, but that there remained as much, or more, after they had all been filled, than there had been at first presented to Him.