'Flashing' in the Bible

when I sharpen My flashing sword,and My hand takes hold of judgment,I will take vengeance on My adversariesand repay those who hate Me.

He said,“The Lord came from Sinai,And dawned on them from Seir;He shone forth from Mount Paran,And He came from the midst of ten thousand holy ones;At His right hand there was flashing lightning for them.