1 Chronicles 6

The sons of Levi were Gershon, Kohath, and Merari. v.1

Read chapter 6
This chapter gives the genealogy of the tribe of Levi.  The tribe of Levi was a special tribe that had special jobs set apart of the rest of Israel.  Levites are people from this tribe of Levi and if you think Levite you usually associate the name as a priest.  Now yes the tribe of Levi were priest but not all Levites were high priest.  The high priests were in the line of Aaron (Moses' brother) who was the grandson of Kohath the son of Levi.  So from Levi we get our priests and high priests.  Another special task given to the tribe of Levi were the singers and musicians appointed by David for service at the tabernacle.  From all three sons of Levi (Gershon, Kohath and Merari) came those appointed to ministry with music.  Now out of all the tribes of Israel, the tribe of Levi had to preserver it's genealogy the most due to these special privileges that not just anyone could be; they had to prover their genealogy because their privilege depended on their family ties.  This was a special honor for the tribe of Levi.  This may have made other non-Levites jealous, they may have made some Levites not want to be a priest or musician, but this was the will the Lord had for the tribe of Levi.  So maybe in our family or job, we may wish to have someone else's job or family or someone may wish to have our job or our family, but the Lord has you placed specifically for His will.  Who do you wish you could be instead of who you are?  Crazy to realize that others are jealous of you whether you realize it or not, so how can you not take for granted the life you were given?