1)
"Vayedaber Hashem el Moshe Leimor". Why does the Torah add the word "Leimor"?
2.
R. Bachye #1: It means 'to tell Yisrael'.
3.
R. Bachye #2: It refers to the Nistar (the deeper meaning of whatever Hashem is teaching Moshe),
1
as it does throughout the Torah.
1
See R. Bachye who elaborates, based on the difference between Dibur and Amirah.