'Flashing' in the Bible

And he drove out Man; and he set the Cherubim, and the flame of the flashing sword, toward the east of the garden of Eden, to guard the way to the tree of life.

and say to the forest of the south, Hear the word of Jehovah. Thus saith the Lord Jehovah: Behold, I will kindle a fire in thee, and it shall devour every green tree in thee, and every dry tree: the flashing flame shall not be quenched; and all that it meets from the south to the north shall be burned thereby.