John Chrysostom
Catena Aurea · Johannesevangelium 6
Then said they unto him, What shall we do, that we might work the works of God? Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent. They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work? Our fathers did eat manna in the desert; as it is written, He gave them bread from heaven to eat. Then said Jesus unto them, Verily, verily, I say unto you, Moses gave you not that bread from heaven; but my Father giveth you the true bread from heaven. For the bread of God is he which cometh down from heaven, and giveth life unto the world. Then said they unto him, Lord, evermore give us this bread.
(Hom. xlv. 1) Nothing can be more unreasonable than their asking for another miracle, as if none had been given already. And they do not even leave the choice of the miracle to our Lord; but would oblige Him to give them just that sign, which was given to their fathers: Our fathers did eat manna in the desert.