'Volunteers' in the Bible

Now look! Here are the ranks of the priests and the descendants of Levi for the entire service of the Temple of God, and in all of the work there will be all types of volunteers who have skills for anything needed for the services. Furthermore, the officers and all of the people will be at your complete command."

Your soldiers are willing volunteers on your day of battle; in majestic holiness, from the womb, from the dawn, the dew of your youth belongs to you.