In the second year of travel in the desert, Moshe and Aharon were commanded by the Almighty to count all male Israelites between 20 and 60. There were 603,550 available for military service. The tribe of Levi was exempt because of their special duties as religious leaders. (It is probably from here that countries give divinity deferments to clergy and divinity students.)
The twelve tribes were directed regarding the formation (three tribes were on each side of the Portable Sanctuary) in which they were to camp and travel.
The 22,300 Levites were commanded in the Sanctuary service. The family of Gershon was to transport the coverings of the Sanctuary. The family of Kehos carried the Ark, Table, Menorah and Altars. The family of Merari transported the boards, pillars, bolts and sockets.
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based on Growth Through Torah by Rabbi Zelig Pliskin
The Torah states:
“And the Almighty spoke to Moshe in the wilderness of Sinai” (Numbers 1:1).
Why does the Torah specify “the wilderness” of the Sinai desert? It would have been sufficient to say “in the Sinai desert”; everyone knows that deserts are wildernesses.
The Midrash Bamidbar Rabbah comments on this verse, “Whoever does not make himself open and free like a wilderness will not be able to acquire wisdom and Torah”. This refers to having the trait of humility which allows a person to learn from everyone and to teach everyone.
An arrogant person will only be willing to learn from someone he feels is befitting his honor. A humble person is only concerned with gaining Torah knowledge and will be grateful to learn new ideas even from one who has less overall knowledge than himself.
The Midrash teaches that the Torah was given on Mt. Sinai because Mt. Sinai was the lowest of all the mountains. This symbolizes that if a person wants to receive wisdom he must be humble. If he is full of himself there is little room for anything else.