“Aaron is to present the Levite’s before the Lord as a wave offering from the Israelites, so that they may be ready to do the work of the Lord.”
Before employment, steps are taken in preparation for the tasks that will be required in that field. Many professions require secondary schooling. Being called to work for God is no different; Christians must be baptized and ministers must be ordained. We must first give ourselves to the Lord and then to our services.
Lock Your Wings 
““This is the rule the Levites must follow: They must begin serving in the Tabernacle at the age of twenty-five, and they must retire at the age of fifty.”
Numbers 8:24-25 NLT
Interesting that there is a clear start and end.
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