In this video, Sheikh Ahmad Deedat answers a question regarding the Prophet Muhammad in the Bible and why he was unlearned that this is a fulfillment of a prophecy in the Bible. It is explicitly stated in the Book of Isaiah 29: 12 (And the book is delivered to him that is not learned, saying, Read this, I pray thee: and he saith, I am not learned.)
Actually, if we look at the religious history of man in the Bible, we will never find an occasion in which a prophet of God said this except Prophet Muhammad (peace be upon him) as it is proved in his biography.
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Source: Ahmed Deedat Youtube channel