In this "lost scripture" called the Ascension of Isaiah, the prophet gets a tour of the heavens. Jimmy Akin and Dom Bettinelli discuss what Isaiah sees, including what sees concerning Jesus, and what it means for us today.
https://mysterious.fm/333
Further Resources:
• James Charlesworth’s book Old Testament Pseudepigrapha vol. 2: https://amzn.to/3StJdGv
• Jonathan Knight’s book The Ascension of Isaiah: https://amzn.to/3yevBZ7
• Jan Bremmer et al.’s book The Ascension of Isaiah: https://amzn.to/4d85Ad9
• Richard Bauckham’s book The Climax of Prophecy: https://amzn.to/3A90pLn
• Online translation of the Ascension of Isaiah: https://www.earlychristianwritings.com/text/ascension.html