דברי הימים ב, פרק ל״ו, פסוק ח׳

The end of King Jehoiakim's reign is marked by a dark legacy of wickedness, prompting the historical record to direct readers elsewhere for the full account of his actions. While his terrible deeds are noted, they are not explicitly detailed in this specific account [ביאור שטיינזלץ]. Some traditions, however, suggest that his crimes reached the extreme severity of incest, specifically pointing to relations with his own mother [רש״י].

Beyond his known acts, there is also a mention of things that were discovered about the king, a concept understood in several distinct ways. One perspective suggests a physical mark, such as a tattoo found on his body [רש״י, מלבי״ם]. Alternatively, this might describe terrible acts he committed in secret that were only brought to light after some time had passed [מצודת דוד]. A third approach views this discovery in a literary sense, referring to the various accounts and stories recorded about him in other texts [מלבי״ם, ביאור שטיינזלץ].

These accounts are said to be documented in the historical records of the kings of Israel and Judah. Yet, the actual Book of Kings only offers a vague, general summary of his sins without any specifics. Because of this, commentators explain that the true reference is likely the Book of Jeremiah. The prophet Jeremiah clashed with Jehoiakim on multiple occasions, and it is within his prophetic writings that the king's abominations are detailed extensively [רד״ק, ביאור שטיינזלץ].