http://revach.net/article.php?id=5323

Section: Parshas HaShavua   Category: Quick Vort
Parshas Bahaloscha: Chizkuni - Shevet Levi, A Family Tradition of Excellence

Hashem tells Moshe Rabbeinu to designate Shevet Levi for Avodah in the Bais HaMikdash. The pasuk (Bahaloscha 8:19) then says, "ולא יהיה בבני ישראל נגף בגשת בני ישראל אל הקודש", so that a death will not spread when the Bnei Yisroel approaches the Mishkan. Rabbeinu Bachaye and other Meforshim explain that the Levi'im will act as guards not allowing Bnei Yisroel to come too close, because a Zar who comes close will die.

The Chizkuni takes a unique approach in explaining this pasuk. He says that before Levi was designated as the overseers of the Avodas HaMishkan, the natural choice was the Bechorim. However, says the Chizkuni, that presents a problem. Since a bechor can be the son of a non-bechor and the grandson of a non-bechor, he would have no family tradition regarding the avodah. This can cause him to do the avodah in an improper way that would make him liable to death.

Because of this, Hashem in His mercy, designated a Shevet to be in charge of the avodah so that they would have a long and rich tradition of avodah, ingraining it in their family genes for generations, thus saving many casualties in this highly sensitive and dangerous workplace!