Passover: How the Holy Temple Observed
They would chant the Hallel for each group at least three times. Accordingly, there were nine shofar blasts. When all of this was finished they would allow the next group in after the first group left. This occurred three times. If the 14th day of Nisan were Shabbat everything was done the same way except that the people could not take the meat home with them until after Shabbat.