3 Nephi 19:3

yea, and even all the night it was noised abroad concerning Jesus; and insomuch did they send forth unto the people, that there were many, yea, an exceeding great number did labor exceedingly all that night, that they might be on the morrow in the place where Jesus should shew himself unto the multitude.

All night long the news spread about Jesus. Many people sent out the message. A very large number of people worked hard all night. They wanted to be at the place where Jesus would show himself to the crowd the next day.

All through the night, news about Jesus traveled from person to person. So many people worked through the darkness preparing themselves to be there in the morning when Jesus would come.