'Service' in the Bible

I know your doings, your love, your faith, your service, and your patient endurance; and that of late you have toiled harder than you did at first.

For this reason they stand before the very throne of God, and render Him service, day after day and night after night, in His sanctuary, and He who is sitting upon the throne will shelter them in His tent.

"In future there will be no curse," he said, "but the throne of God and of the Lamb will be in that city. And His servants will render Him holy service and will see His face,