Ring a bell?
Isaiah 6:9
He said, “Go and tell this people: “‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’
Matthew 13:14
In them is fulfilled the prophecy of Isaiah: “‘You will be ever hearing but never understanding; you will be ever seeing but never perceiving.
Mark 4:12
so that, “‘they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven!’”
Acts 28:26
“‘Go to this people and say, “You will be ever hearing but never understanding; you will be ever seeing but never perceiving.”