Leaving Over Meat of the Paschal Offering until Morning
"And you shall let nothing of it remain until the morning"—Exodus 12:10.
It is forbidden to leave over of the meat of the Paschal Offering until the morning of the fifteenth of Nissan [i.e., it must be fully consumed on the night of Passover].
Leaving Over Meat of the Second Passover Offering until Morning
"They shall leave none of it until the morning"—Numbers 9:12.
It is forbidden to leave over of the meat of the Second Passover Offering until the following morning [the morning of the fifteenth of Iyar. Rather, it must be fully consumed on the night of the Second Passover].
Leaving Over Meat of the Festival Offering until the Third Morning
"Nor shall any part of the meat which you sacrificed on the first day at evening remain all night until the morning"—Deuteronomy 16:4.
It is forbidden to leave over of the meat of the Festival Offering that is sacrificed on the fourteenth of Nissan [the eve of Passover] until the third morning, i.e., the morning of the sixteenth of Nissan. Rather it must be eaten within the two days allotted for this purpose.
Pilgrimage to the Holy Temple on the Three Festivals
"Three times a year, all your males shall appear" —Deuteronomy 16:16.
Three times a year [on the festivals of Passover, Shavuot and Sukkot] all men are obligated to go to the Holy Temple, to be "seen" by G‑d. Young boys that have the ability to make their trek on their own should be brought along. Once in the Temple, every man is commanded to bring a Burnt Offering, known as an Olat Re'iyah.
This is one of the three mitzvot associated with the festivals; the other two are offering the Festival Offering and Rejoicing.
The Festival Offering
"Three times shall you celebrate for me in the year"—Exodus 23:14.
We are commanded to celebrate in the Holy Temple thrice yearly [during the festivals of Passover, Shavuot and Sukkot].
This festivity entails the offering of a Peace Offering, known as the Chagigah Offering.
Women are exempt from this mitzvah.
This is one of the three mitzvot associated with the festivals; the other two are Pilgrimage and Rejoicing.