 The first of these filled the court of the Temple, so that the gates had to be closed, and while they were killing and offering their Passover lambs the Levites on the platform ("dukhan") recited the Hallel (Psalms 113-118), accompanied by instruments of brass.If the Levites finished their recitation before the priests had completed the sacrifice, they repeated the Hallel, although it never happened that they had to repeat it twice.As soon as the first group had offered their sacrifice, the gates were opened to let them out, and their places were taken by the second and third groups successively.