1)
Yirmeyah commanded Baruch in Yehoyakim's fourth year (verse 1). Why did he not read it until the ninth month of the fifth year?
1.
Malbim (8-9): He waited, in order to do "like all that Yirmeyah commanded him." He read it in "Beis Hashem, on a Tzom, in the ears of all Yehudah who come from their cities" (verse 6).