1 Chronicles 9:1-44

You get to chapter nine and it declares,

So all of Israel was reckoned by the genealogies; and, behold, they were written in the book of the kings of Israel and Judah, who were carried away to Babylon because of their transgression (1 Chronicles 9:1).

Again God declares that the reason for the fall was their transgressions. Carried away to Babylon. And again we come back now to the priests and the descendants of the priests and the Levites and so forth. And in verse twenty-six, we are told that portion of them.

For these Levites, the four chief porters, were in their set office, and were over the chambers and treasuries of the house of God. And they lodged round about the house of God, because the charge was upon them, and the opening every morning pertained to them (1 Chronicles 9:26-27).

And so it was their duty to just live around it to protect it from vandals and so forth, and every morning to open it up and to set things out. Set out all of the instruments, the vessels for the worship, the fine flour, the wine, the oil, the frankincense, and all.
And in verse thirty-three we get back to the singers.

These are the singers, chief of the fathers of the Levites, who remaining in the chambers were free: for they were employed in that work day and night (1 Chronicles 9:33).

In other words, they were free from the other labors in order that day and night they may spend their whole time in just praising and worshipping the Lord. That would be quite an occupation. Quite a job. Get paid for that. Just being around, worshipping God all the time and getting paid for it.
And so then we jump to in verse thirty-five, the family of Saul again through Jonathan, the descendants of Jonathan. "