What is the significance of "ba'Yom ha'Hu"?
Oznayim la'Torah: It brings out the extent of Pharaoh's cruelty. No sooner did this murderous 1 decree enter his head, than he had to implement it.
Oznayim la'Torah: See 5:21.
Who were the Nogesim (the task-masters), and who were the Shoterim (the officers)?
Rashi and Rashbam: The Shoterim were Jews whose job it was to force their brothers to fulfill their quota of work -- according to the orders issued by the Nogesim, each of whom appointed a number of Shoterim and oversaw their work.
QUESTIONS ON RASHI
Rashi writes: "The 'Nogesim' (oppressors, task-masters) were Egyptian; and the 'Shoterim' (officers) were Yisraelim." How does Rashi know this?
Gur Aryeh: The outcome of this new decree was that "the Nogesim pressured them... 'Finish your work!'" (5:13); whereas, "the Shoterim were beaten" (5:14). The Nogesim must have been Egyptian.
