Augustine of Hippo — as excerpted in the Catena Aurea on John 6:47-51

“(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.”