Parashas Bamidbar · Passuk 4:20
Chabad.org — English translation + Rashi
Source: Sanhedrin 81b.
English:
The pink box will name the middah (from the 13 of R’ Yishmael or the 32 of R’ Eliezer) whenever it can be identified, or give a short positive description of the learning method.
See the core text of Chazal for the derivation.