"The Levites are mine, for all the firstborn are mine. When I struck down all the firstborn in Egypt, I set apart for myself every firstborn in Israel, whether man or animal. They are to be mine. I am the Lord." Numbers 3:12b-13
Did the firstborn from among the Israelites understand the full weight of what God did for them? By all rights, the firstborn of Israel would have been taken with the firstborn of the Egyptians, but God sent His angel to pass over them. Rather than taking the firstborn from each family, God took the Levites in their place as the first fruits offering.
Lord, there are times I wish You would take my firstborn and put him to work somewhere else... there's just something about an 18-year old! His strength of character is often contrasted by his lack of judgment. He is, however, the first fruits - the best I have to offer to the world. He lives up to it; he IS the best mark I can leave on society. Use my son for mighty things. Continue to pour out Your blessing upon him, so You might be glorified.