Bahá’u’lláh did not study the Bayán, nor been acquainted with its contents

In the Epistle to the Son of the Wolf, Bahá’u’lláh explicitly testified that he had "not perused the Bayán, nor been acquainted with its contents" a statement that Baha'is find surprising given Bahá’u’lláh's years as a prominent leader within the Bábí community. While some claim that physical copies of the Persian Bayán were scarce and not widely distributed during that era due to fierce opposition, the primary theological explanation provided in this reddit post is that Bahá’u’lláh possessed innate and unlearned knowledge. In the Tablet of Wisdom, he explained that whenever he needed to know something, the information would appear before him as if in a book, a spiritual capacity that allowed him to demonstrate a perfect understanding of the Báb’s Revelation without formal study! Consequently, despite never physically reading the text, he was able to quote the Báb accurately and address the laws of the Bayán in his own works, such as the Kitáb-i-Aqdas and the Kitáb-i-Badí’.

https://www.bahai.org/library/authoritative-texts/bahaullah/epistle-son-wolf/epistle-son-wolf.xhtml?297c50f7

Baha'is discussing this topic:

https://www.reddit.com/r/bahai/comments/lo0rd1/where_can_i_read_more_about_the_relationship/