'Trembling' in the Bible

'I [am] the God of your fathers, the God of Abraham and of Isaac and of Jacob!' So Moses began trembling [and] did not dare to look at [it].

And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do.

Then he called for a light, and sprang in, and came trembling, and fell down before Paul and Silas,