Matthew 13:14-15 attributes Isaiah 6:9-10 to the prophet Isaiah.
Matthew 13:14-15, New Testament, The Church of Jesus Christ of Latter Day Saints, accessed August 17, 2023
14 And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
15 For this people’s heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.