1)
Why did he say "you (plural) sinned"? Is Yirmeyah included?
1.
Radak: He referred to the nation as a whole, just like Hashem told Moshe "until when do you refuse [to guard my Mitzvos]" (Shemos 16:28) 1 .
1
This is like Rashi's Perush there. Other Perushim hold that Moshe was not blameless! Refer to Shemos 16:28:1:1-3.
2)
Why do we read "ha'Davar ha'Zeh" with the prefix Hei ha'Yedi'ah (to identify)?
1.
Radak: Like Hashem said, so happened to you.
