Deuteronomy 16:8

Six days thou shalt eat unleavened bread; and on the seventh day shall be a solemn assembly to the Lord, thy God, Leviticus 23:36, a high festival day on which all work was forbidden; thou shalt do no work therein. Note that even here the two festivals are considered practically as one, also that the ordinances as originally given were modified, for the entire Passover celebration took place at the central Sanctuary, and the individual houses were no longer regarded as the places of sacrifice, nor was the blood used to paint the door-posts, as in Egypt.