Numbers 9:12

They shall leave none of it unto the morning,.... None of the flesh of the passover lamb, what was left was to be burnt with fire,

Exodus 12:10;

nor break any bone of it; the same was enjoined,

Exodus 12:46;

according to all the ordinances of the passover they shall keep it: as when observed in its time, excepting the feast of unleavened bread, which followed the first passover, and those rites which were peculiar to the passover, as kept at their first coming out of Egypt; as the sprinkling the blood of the lamb on the doorposts, eating it in haste, c.