Adam Clarke on Exodus 23:2

Thou shalt not follow a multitude to do evil - Be singular. Singularity, if in the right, can never be criminal. So completely disgraceful is the way of sin, that if there were not a multitude walking in that way, who help to keep each other in countenance, every solitary sinner would be obliged to hide his head. But רבים rabbim, which we translate multitude, sometimes signifies the great, chiefs, or mighty ones; and is so understood by some eminent critics in this place: "Thou shalt not follow the example of the great or rich, who may so far disgrace their own character as to live without God in the world, and trample under foot his laws." It is supposed that these directions refer principally to matters which come under the eye of the civil magistrate; as if he had said, "Do not join with great men in condemning an innocent or righteous person, against whom they have conceived a prejudice on the account of his religion," etc.