'Ministering' in the Bible

They were ministering with song before the tabernacle of the tent of assembly until Solomon built the temple of Yahweh in Jerusalem. And they stood according to their order with respect to their duty.

Let no one enter into the house of Yahweh except the priests and the ministering Levites. They themselves may enter, for they [are] holy, but all the people shall keep the requirements of Yahweh.