Nehemiah 12:27

And at the dedication of the wall of Jerusalem
In which many priests and Levites assisted, and seems to be the reason of the above account of them; the dedication of the wall takes in the whole city, gates, and houses, ( Nehemiah 12:30 ) , and if a new house was to be dedicated, much more a new city, and especially the holy city, in which stood the temple of the Lord, see ( Deuteronomy 20:5 ) , this dedication was made by prayer and songs of praise, as follow, and no doubt by sacrifices, and was kept as a festival; and indeed, according to the Jewish writers {q}, it was annually observed on the seventh of Elul, or August; it was on the twenty fifth of that month that the wall was finished, ( Nehemiah 6:15 ) , but the gates were not set up, and all things for the dedication were not ready till Elul, or August, following; and then all being finished, they made and served the seventh of that month as a festival:

they sought the Levites out of all their places, to bring them to
Jerusalem, to keep the dedication with gladness;
to assist in the solemnity of the day both with vocal and instrumental music, as follows:

both with thanksgiving and with singing;
with songs of praise and thankfulness vocally, that they had been able, notwithstanding all the malice of their enemies, to build the wall in so short a time; or with a song, perhaps the thirtieth psalm was sung on this occasion:

with cymbals, psalteries, and with harps;
some playing on one, and some on another, which were the three principal instruments of music used by them, see ( 1 Chronicles 15:16 ) .

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FOOTNOTES:

F17 Megillath Thainith, c. 3. apud Selden. de Synedr. l. 3. c. 13. sect. 12.