'Fearful' in the Bible

Who is like you, O Lord, among the gods? Who is like you? -- majestic in holiness, fearful in praises, working wonders?

He said, "See, I am going to make a covenant before all your people. I will do wonders such as have not been done in all the earth, nor in any nation. All the people among whom you live will see the work of the Lord, for it is a fearful thing that I am doing with you.