Nehemiah 11:23

for the command of the king is upon them, and support is for the singers, a matter of a day in its day.

Ezra 6:8-9

And by me is made a decree concerning that which ye do with the elders of these Jews to build this house of God, that of the riches of the king, that are of the tribute beyond the river, speedily let the outlay be given to these men, that they cease not;

1 Chronicles 9:33

And these who sing, heads of fathers of the Levites, in the chambers, are free, for by day and by night they are over them in the work.

Ezra 7:20-24

and the rest of the needful things of the house of thy God, that it falleth to thee to give, thou dost give from the treasure-house of the king.

Nehemiah 12:47

And all Israel in the days of Zerubbabel, and in the days of Nehemiah, are giving the portions of the singers, and of the gatekeepers, the matter of a day in its day, and are sanctifying to the Levites, and the Levites are sanctifying to the sons of Aaron.

Treasury of Scripture Knowledge

Summary

For it was the king's commandment concerning them, that a certain portion should be for the singers, due for every day.

Bible References

The king's

1 Chronicles 9:33
And these who sing, heads of fathers of the Levites, in the chambers, are free, for by day and by night they are over them in the work.
Ezra 6:8
And by me is made a decree concerning that which ye do with the elders of these Jews to build this house of God, that of the riches of the king, that are of the tribute beyond the river, speedily let the outlay be given to these men, that they cease not;
Ezra 7:20
and the rest of the needful things of the house of thy God, that it falleth to thee to give, thou dost give from the treasure-house of the king.