'Service' in the Bible

We will impose the following commands on ourselves: To give an eighth of an ounce of silver yearly for the service of the house of our God:

The leader of the Levites in Jerusalem was Uzzi son of Bani, son of Hashabiah, son of Mattaniah, son of Mica, of the descendants of Asaph, who were singers for the service of God’s house.

They performed the service of their God and the service of purification, along with the singers and gatekeepers, as David and his son Solomon had prescribed.

I also found out that because the portions for the Levites had not been given, each of the Levites and the singers performing the service had gone back to his own field.