Helaman 5:42

And it came to pass that they all did begin to cry unto the voice of him which had shook the earth; yea, they did cry even until the cloud of darkness was dispersed.

They all began to pray to the one whose voice had shaken the earth. They prayed until the dark cloud went away.

So they all began crying out to the voice that had shaken the earth. They kept crying out until the cloud of darkness disappeared.