Lesson for us.
Ezra himself had a notable genealogy, he was an Aaronic priest, descended from Eleazar and Phinehas, and from the high priest Seraiah who was executed by Nebuchadnezzar.
The Insight book says " he exhibited unusual zeal in searching the official documents of his nation, and it is evidently due to his efforts that we have the accurate record Chronicles gives us...he had God's spirit..and...God guided him with a view to preserving a great portion of Israel's history ".
Later historians such as Josephus and Luke have much to thank Ezra for, and we can be grateful for his painstaking care in compiling these records.