And what was seen was so terrible that even Moses said: "I am terrified, and so, I tremble.
Other versions
King James Version
And so terrible was the sight, that Moses said, I exceedingly fear and quake:)English Standard Version
Indeed, so terrifying was the sight that Moses said, "I tremble with fear."New International Version
The sight was so terrifying that Moses said, "I am trembling with fear."