What does Nehemiah 12:42 mean?

and above the gate of Ephraim, and by the old gate, and by the fish gate, and the tower of Hananel, and the tower of Hammeah, even to the sheep gate: and they stood still in the gate of the guard.

So the two companies of those who gave thanks in God’s house stood, and I, and the half of the rulers with me;

and the priests, Eliakim, Maaseiah, Miniamin, Micaiah, Elioenai, Zechariah, and Hananiah, with trumpets;

They offered great sacrifices that day, and rejoiced; for God had made them rejoice with great joy; and the women and the children also rejoiced; so that the joy of Jerusalem was heard even far away.

On that day were men appointed over the rooms for the treasures, for the wave offerings, for the first fruits, and for the tithes, to gather into them, according to the fields of the cities, the portions appointed by the law for the priests and Levites; for Judah rejoiced for the priests and for the Levites who waited.

They performed the duty of their God, and the duty of the purification, and so did the singers and the gatekeepers, according to the commandment of David, and of Solomon his son.