Judges 16:2

And it was told the Gazites, saying, Samson is come hither. And they compassed him in, setting watchmen all about the harlot's house, and laid wait for him all night in the gate of the city, men charged with taking him as soon as he should attempt to leave, and were quiet all the night, lest they should reveal their plans to Samson, saying, In the morning, when it is day, we shall kill him. With the coming of the dawn, when it would become light outside, they would have the courage to attack their enemy.