Why did Hashem find it necessary to instruct Yisrael to bring the Korban Pesach?
Rashi and Ramban: Because Hashem initially told them 1 them that they would bring the Korban Pesach when they entered Eretz Yisrael.
Rashbam: Because Pesach Mitzrayim lasted only one day and the Korban Pesach was different than it was originally intended to be brought. 2 It was therefore necessary to tell them to bring it in the regular manner.
Seforno: In spite of the Simchah of the eighth day of the Milu'im and the Chanukas ha'Mizbe'ach, they were to bring the Korban Pesach. 3
Having told them that they would bring the Korban Pesach after they entered Eretz Yisrael, why did He command them to bring it now?
Ramban #1: Because He wanted them to have a remembrance of the redemption and the miracles that they and their fathers had just experienced, to hand down to their children, and their children to their children. 1
Why did Yisrael not bring the Korban Pesach during the forty years that they spent in the desert?
Rashi and Ramban #1: Refer to 9:2:1:1.
Ramban #2: Refer to 9:1:2:1**.
Ramban #4: Simply because they were lax and did not take the trouble to bring it. 2
Ramban: As a result of which they were placed in Cherem and the north wind did not blow. Consequently, they were forbidden to eat Kodshim. It is obvious however, that they kept the Yom-Tov of Pesach and di not eat Chametz for seven days