Tremble. — Literally, be in travail. This answer to his question is introduced with consummate art. Well may the mountains tremble, when it is the Lord of all the earth, the God of Jacob, who is present. Notice that till now the mention of the Divine power which wrought the deliverance was kept in suspense.
Related Commentaries of Psalms 114:7
Psalms 114:7
7 Tremble, thou earth, at the presence of the Lord, at the presence of the God of Jacob;