2 Kings 21:17 (ESV)

17 Now the rest of the acts of Manasseh and all that he did, and the sin that he committed, are they not written in the Book of the Chronicles of the Kings of Judah?

Here is a referral for further information to documents well-known to us (the book of Chronicles in the Bible). Besides this, it is remarkable that here, once again, the sinful practices of Manasseh are mentioned. Looking at the original text, one may consider translating the reference to his sins as “his seriously sinful practices.”