Source for separating Levites from regular Jews, as a family: Pesachim 104a
Source for separating Levites from Kohanim, as a famliy: Pesachim 104a
Height of Moshe and the Levites: Shabbat 92a
Establishing Lineage
Based on a Brother's Testimony: Ketuvot 25b
Cities of the Levites
How much space is given to the border areas of the city: Eruvin 56b-57a
Measuring the border areas: Eruvin 51a
Converting its border areas into urban areas, or vice versa: Makkot 12a