Jamieson, Fausset and Brown on Exodus 14:5

5. the heart of Pharaoh and of his servants was turned against the people, &c.--Alas, how soon the obduracy of this reprobate king reappears! He had been convinced, but not converted--overawed, but not sanctified by the appalling judgments of heaven. He bitterly repented of what he now thought a hasty concession. Pride and revenge, the honor of his kingdom, and the interests of his subjects, all prompted him to recall his permission to reclaim those runaway slaves and force them to their wonted labor. Strange that he should yet allow such considerations to obliterate or outweigh all his painful experience of the danger of oppressing that people. But those whom the Lord has doomed to destruction are first infatuated by sin.