"When sorrows come, they come not single spies, but in battalions" is a line from which play of William Shakespeare?

The phrase “When sorrows come, they come not single spies, but in battalions” was said by Claudius in William Shakespeare play, Hamlet, Act IV, Scene V. In this play, Claudius uses the line when talking with Gertrude. It is focused on the fact that when a bad incident occurs, it doesn’t happen alone. When one is faced with a human tragedy, it often seems that many bad things occur simultaneously. We may use this particular quote when we see several bad things happening together.