Misfortunes never come singly

Misfortunes never come singly.

Prov. Bad things tend to happen in groups. I already told you that my wife lost her job. Well, misfortunes never come singly; our house was robbed last night.
See also: come, never
References in classic literature ?
Misfortunes never come singly, and the affairs of the reorganization of the native tribes, and of the irrigation of the lands of the Zaraisky province, had brought such official worries upon Alexey Alexandrovitch that he had been of late in a continual condition of extreme irritability.