Why does the Torah divide the Parshah of Mo'ados into four Diburim (to Bnei Yisrael) - the current Pasuk, and Pesukim 2, 24, 34?
Ramban, Moshav Zekenim: It is because each one includes something new. It combines Shavu'os with the Omer because its timing depends on the Omer; 1 and Yom Kipur with Rosh Hashanah because they both pertain to atonement for sinners who repented. 2
What does "v'Henif Es ha'Omer" entail?
What are the ramifications of "Reishis Ketzirchem"?
Rashi: It means that the Omer must be brought from the first harvest of that year's crops, 1 (a prohibition against harvesting one's crops before the Omer is brought on the 16th of Nisan (Rashi, Pesachim, 11a and Ramban).
See Sifsei Chachamim. See also Ramban.
What are the connotations of "u'Ketzartem es Ketzirah"?
Rashi (Shabbos, 131a): It is a Mitzvah to cut the Omer li'Shemah (for the sake of the Mitzvah).
What is the definition of "Omer"?