Job 26:13 - Ellicott's Commentary On The Whole Bible

The crooked serpent. — By this expression is doubtless meant the forked lightning-flash, though it is difficult to determine whether any, or what mythological ideas may underlie the expression, or whether it is anything more than a figure derived from the natural world, which suggested the similitude of the flying serpent. Others understand by it the constellation of the Northern Dragon, to whose influence storms were ascribed.