And the LORD did according to the word of Moses; and he removed the swarms [of flies] from Pharaoh, from his servants, and from his people; there remained not one.
Ver. 31. There remained not one.] Prayer makes clean work; it can do wonders in heaven and earth. Say thou with David, "Cleanse thou me from secret faults," Psa 19:12 those that are of daily and hourly incursion. Prayer will scour the coast, clear the conscience of dead works. Act 8:22