What is "u'Shemartem Es ha'Davar ha'Zeh" referring to?
Ramban: It refers to the basic Korban Pesach mentioned in 12:21, 1 and not to the blood that is mentioned immediately prior to it.
Mechilta: With reference to 12:21, it teaches us that also future Pesachim must comprise a lamb or a kid-goat. 2
Ramban: Even though that does not immediately precede the current Pasuk. See similar examples of this in 12:25, and in Devarim 15:14.
See Torah Temimah, note 198.
How will we reconcile the Pasuk, "l'Chok Lecha ul'Vanecha" and the fact that "Banecha" always excludes women, with the opinion that women are obligated to bring the Korban Pesach?
Why do we say that bringing the Korban Pesach is [only] an Aseh, when the term "u'Shemartem" always refers to a Lav?
The Moshav Zekenim citing Sefer ha'Gan leaves this question unanswered.