'Trembling' in the Bible

Hebrews went across the Jordan to the land of Gad and Gilead, but Saul remained in Gilgal, and all the people followed him, trembling.

Samuel did what the LORD said and went to Bethlehem. The elders of the town came out to meet him trembling, and said, "May your coming be in peace."

David came to Nob to Ahimelech the priest, and Ahimelech was trembling as he came to meet David. Ahimelech told him, "Why are you alone, and no one with you?"