Nehemiah 11:23

For there was a command from the [Persian] king regarding the singers, as to their daily task.

Ezra 6:8-9

Also, I issue a decree as to what you are to do for these Jewish elders for the rebuilding of this house of God: the full cost is to be paid to these people from the royal treasury out of the taxes of the provinces west of the River, and that without delay.

1 Chronicles 9:33

Now these are the singers, heads of the fathers’ households of the Levites, living in the temple chambers, free from other service because they were on duty day and night.

Ezra 7:20-24

The rest of the things required for the house of your God, which you may have occasion to provide, provide it from the royal treasury.

Nehemiah 12:47

So in the days of Zerubbabel and [later of] Nehemiah, all Israel would give the daily portions for the singers and the gatekeepers; and they set apart the consecrated portion for the Levites, and the Levites set apart the consecrated portion for the sons of Aaron [the priests].

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
Now these are the singers, heads of the fathers’ households of the Levites, living in the temple chambers, free from other service because they were on duty day and night.
Ezra 6:8
Also, I issue a decree as to what you are to do for these Jewish elders for the rebuilding of this house of God: the full cost is to be paid to these people from the royal treasury out of the taxes of the provinces west of the River, and that without delay.
Ezra 7:20
The rest of the things required for the house of your God, which you may have occasion to provide, provide it from the royal treasury.