The Gospel of John - 6:41-71
Imagine being in the shoes of those who were listening to Jesus. He has made some incredibly bold claims, saying that He was the literal son of God. He also claimed to be from heaven. But these people knew Jesus when He was a boy and even knew His parents. For Him to make these claims was unbelievable and they grumbled as a result. But then, just as now, Jesus requires complete acceptance of His Lordship and any attempt to reject or alter His identity is equivalent to rejecting His message.