וְנֹ֙גַהּ֙ כָּא֣וֹר תִּֽהְיֶ֔ה קַרְנַ֥יִם מִיָּד֖וֹ ל֑וֹ וְשָׁ֖ם חֶבְי֥וֹן עֻזֹּֽה׃
And a brightness appeareth as the light; rays hath He at His side; and there is the hiding of His power.
Read kabbalistic (mystical) interpretation of Habakkuk 3:4: and classical mystical sources.