“The “mixed multitude” had been the first to indulge murmuring and impatience, and they were the leaders in the apostasy that followed.”  (p.315)

“… a mixed multitude went up also with them.” In this multitude were not only those who were actuated by faith in the God of Israel, but also a far greater number who desired only to escape from the plagues, or who followed in the wake of the moving multitudes merely from excitement and curiosity. This class were ever a hindrance and a snare to Israel.” (p.281)

Patriarchs and Prophets p.315 & 281
by Ellen G. White