'Ministering' in the Bible

And because of the cloud, the priests were not able to continue ministering, for the glory of the Lord filled God’s temple.

Now according to the ordinance of his father David, he appointed the divisions of the priests for their service, and the Levites for their duties of praise and ministering before the priests according to the daily rule, and the gatekeepers by their divisions at every gate; for David the man of God had so commanded.

“But as for us, Yahweh is our God. We have not abandoned Him; the priests ministering to the Lord are descendants of Aaron, and the Levites serve at their tasks.

And that's exactly what happened. While Jehu was punishing Ahab's dynasty, he located the princes of Judah and the sons of Ahaziah's brothers who were ministering to Ahaziah, and he put them to death.

And none doth enter the house of Jehovah except the priests, and those ministering of the Levites (they go in for they are holy), and all the people keep the watch of Jehovah:

When they had finished, they brought the rest of the money before the king and Jehoiada; and it was [melted down and] made into utensils for the house of the Lord, utensils for ministering and for burnt offerings, and bowls and utensils of gold and silver. And they offered burnt offerings in the house of the Lord continually all the days of Jehoiada.

My sons, be not now at rest, for on you hath Jehovah fixed to stand before Him, to serve Him, and to be to Him ministering and making perfume.'