'Serving' in the Bible

Then King Rehoboam took counsel with the elders who had been {serving} before Solomon his father when he was alive, saying, "What word do you advise to answer this people?"

But he forsook the advice of the elders that advised him and took counsel of the young men who had grown up with him who were {serving} before him.

For the Levites left their pasturelands and their property and came to Judah and to Jerusalem, for Jeroboam and his sons had rejected them from serving as priests to Yahweh.

But as for us, Yahweh [is] our God, and we have not forsaken him. The priests serving Yahweh [are] the sons of Aaron, the Levites, according to their service.

These were serving the king, besides [those] whom the king had placed in the fortified cities throughout all Judah.