English: Rava said: You will not find a Torah scholar who issues rulings except one who comes from the tribe of Levi or from the tribe of Yissachar.
The classical source expands or derives a specific point from the language of the passuk. The Core Text above is the relevant region of interest.
Type of Learning
Custom (A tribal association of the capacity to teach and rule in halakhah.)
What Is Learned
The verse that assigns the teaching of mishpatim and Torah to Levi is joined with the known dedication of Yissachar to study. Together they identify the primary tribal sources of authoritative Torah instruction.