All these events can be found in The Chronicles that were written in the days of Nehemiah.
When Nehemiah searched for the books of David, the kings, the prophets, and [anything] that had information about the sacrifices, he collected them into a collection.
So did Judah, when he collected the books that were scattered and dispersed in the storm of the war throughout the land.
They are being guarded in our hands, and if you are desiring of them, send to us and they will be sent to you.
Now, we wrote for you all of these things, so that you will celebrate this festival with us according to what is fit for you.