John Gill Commentary Jeremiah 36:11

"And when Micaiah the son of Gemariah, the son of Shaphan, had heard out of the book all the words of Jehovah," — Jeremiah 36:11 (ASV)

When Micaiah the son of Gemariah, the son of Shaphan Who was present when Baruch read in the roll to the people in his father's chamber; but his father was absent, and was with the princes in the secretary's office at the same time, as (Jeremiah 36:12) shows: the son seems to be a more religious man than the father, unless he was placed as a spy, to hear and see what he could.

However, when he had heard out of the book all the words of the Lord: which were spoken by the Lord to Jeremiah, and which Baruch read out of the book he had written in his hearing; for it is a vain conceit of Abarbinel, that Micaiah did not hear these words from the mouth of Baruch reading, but out of the book which he looked into; for then it would have been said, which he had "seen" or "read" out of the book, and not "heard".