'Trembling' in the Bible

[Some] of the Hebrews crossed over the Jordan to the land of Gad and Gilead. But Saul was still at Gilgal, and all the army {followed him trembling}.

So Samuel did what Yahweh said. He came to Bethlehem, and the elders of the city came trembling to meet him. They said, "{Have you come in peace}?"

Now David came to Nob, to Ahimelech the priest. And Ahimelech came trembling to meet David, and he said to him, "Why are you alone and there are no men with you?"