Psalms 47:1 - 9
KJV - 1 O clap your hands, all ye people; shout unto God with the voice of triumph. 2 For the LORD most high is terrible; he is a great King over all the earth.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
The word terrible in the Hebrew bible is ירא which simply means fear. Like all over the bible the fear of the lord is a good thing, but in time the word terrible came to have connotations of bad things. Even from its Latin root it is not a bad word.