Jamieson, Fausset and Brown on 1 Samuel 12:7-16

7-16. Now therefore stand still, that I may reason with you--The burden of this faithful and uncompromising address was to show them, that though they had obtained the change of government they had so importunely desired, their conduct was highly displeasing to their heavenly King; nevertheless, if they remained faithful to Him and to the principles of the theocracy, they might be delivered from many of the evils to which the new state of things would expose them. And in confirmation of those statements, no less than in evidence of the divine displeasure, a remarkable phenomenon, on the invocation of the prophet, and of which he gave due premonition, took place.