Berean Standard Bible
Isaiah 6:9
“And He replied: “Go and tell this people, ‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’”

In context
7And with it he touched my mouth and said: “Now that this has touched your lips, your iniquity is removed and your sin is atoned for.”
8Then I heard the voice of the Lord saying: “Whom shall I send? Who will go for Us?” And I said: “Here am I. Send me!”
9And He replied: “Go and tell this people, ‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’
10Make the hearts of this people calloused; deafen their ears and close their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn and be healed.”
11Then I asked: “How long, O Lord?” And He replied: “Until the cities lie ruined and without inhabitant, until the houses are left unoccupied and the land is desolate and ravaged,
Berean Standard Bible · A modern, readable English translation. Public domain (CC0).