We know that all letter in the Torah has a purpose. A lot of laws are learned from a little thing in the Torah, etc.
What is the purpose of all the details in the counting of Benei Yisrael in Parashat Bemidbar?
For example, why the number of Yehuda tribe is repeated in (2,4)?
The idea of the importance of counting, showing the חשיבות of every Yehudi, is known. But why all the details, especially when repeated? Kind of יפה מנינם של אבות מתורתם של בנים ?... Sure there is something else...