레위기 8:4의 무사르

קרא משה לאהרן ולזקני ישראל – Moses called to Aaron, his sons, and to the elders of Israel . Rashi explains that this was in order to announce to them that the appointment of Aaron as High Priest was decreed from above, and that Moses had not used his prerogative in this matter. This is strange. We have already heard this in the previous פרשה where the Torah reported in 8,4: "And when the community was assembled at the entrance of the Tent of Meeting." This had been in response to G–d's command to assemble the whole congregation at that entrance. Why, in that instance, was mention made of the whole congregation being assembled?