Parashas Bamidbar · Passuk 4:12
They shall take all the service vessels with which the service in the sanctuary is performed, put them into a blue cloth and cover them with a covering of dolphin skin, which they shall then place on a carrying frame.
Chabad.org — English translation + Rashi
Source: Shabbos 98b.
English: “With which they serve in the holy” — \ldots teaching further rules of the vessels in service.
In context: Additional units on the same phrase address related laws of the sacred utensils.
Custom
Chazal continue to extract practical vessel laws from the description of the Kehasite charge.