דברי הימים ב, פרק ל״ה, פסוק י״ז

The Israelites gathered together to observe the Passover sacrifice at its proper time, immediately followed by a seven-day observance of the Festival of Unleavened Bread. The primary approach among commentators is that the specific mention of those present refers to the people who were physically in Jerusalem during this time.

Observing the Festival of Unleavened Bread involved much more than a general celebration. It was defined by a specific schedule of sacrifices dedicated to the holiday. This included the fixed sacrifices offered every day, as well as the special burnt offerings and peace offerings brought by the visiting pilgrims throughout the entire seven-day period [מצודת דוד].