Berean Standard Bible
John 12:39
“For this reason they were unable to believe. For again, Isaiah says:”

In context
37Although Jesus had performed so many signs in their presence, they still did not believe in Him.
39For this reason they were unable to believe. For again, Isaiah says:
41Isaiah said these things because he saw Jesus’ glory and spoke about Him.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).