מִ֥י זֶה֮ מֶ֤לֶךְ הַכָּ֫ב֥וֹד יְ֭הוָה עִזּ֣וּז וְגִבּ֑וֹר יְ֝הוָ֗ה גִּבּ֥וֹר מִלְחָמָֽה׃
Radak on Psalms
Who is the King of Glory ? – as if the gates were asking, Who is the King of Glory ? And the reply:
Radak on Psalms
The Lord strong and mighty, The Lord mighty in battle: – And he uses these adjectives because the ark used to go out with them in battle, and they were victorious over their enemies by its aid.