"Tent of Meeting to the East"

"The Lord has reigned, nations will quake; [before] Him Who dwells between the cherubim, the earth will falter." {Tehillim 99:1}

Camping in front of the Mishkan, in front of the Tent of Meeting to the east were Moses, Aaron and his sons... [Bamidbar 3:38] 

Rashi coments: Adjacent to them was the division of the camp of Yehudah, with whom Yissachar and Zevulun camped. The righteous man prospers and his neighbor prospers! Since they were neighbors of Moshe, who was engaged in Torah study, they became great Torah scholars.

Source:

Shirat Devorah [b]ased on Likutei Sichos vol 33, pp 16-17 Lubavitcher Rebbe