Augustine of Hippo
Catena Aurea · Johannesevangelium 6
Verily, verily, I say unto you, He that believeth on me hath everlasting life. I am that bread of life. Your fathers did eat manna in the wilderness, and are dead. This is the bread which cometh down from heaven, that a man may eat thereof, and not die. I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever.
(Tr. xxvi. 11) And because they had taunted Him with the manna, He adds, Your fathers did eat manna in the wilderness, and are dead. Your fathers they are, for ye are like them; murmuring sons of murmuring fathers. For in nothing did that people offend God more, than by their murmurs against Him. And therefore are they dead, because what they saw they believed, what they did not see they believed not, nor understood.