Read the Douay-Rheims Latin Vulgate Bible everyday from Genesis to Apocalypse, the reading is currently at: Exodus 8:11-20
11 And the frogs shall depart from thee, and from thy house, and from thy servants, and from thy people; and shall remain only in the river. 12 And Moses and Aaron went forth from Pharao: and Moses cried to the Lord for the promise, which he had made to Pharao concerning the frogs. 13 And the Lord did according to the word of Moses: and the frogs died out of the houses, and out of the villages, and out of the fields: 14 And they gathered them together into immense heaps, and the land was corrupted. 15 And Pharao seeing that rest was given, hardened his own heart, and did not hear them, as the Lord had commanded.
15 "Hardened his own heart"... By this we see that Pharao was himself the efficient cause of his heart being hardened, and not God.-- See the same repeated in ver. 32. Pharao hardened his heart at this time also: likewise chap. 9. 7, 35, and chap. 13. 15.
16 And the Lord said to Moses: Say to Aaron, Stretch forth thy rod, and strike the dust of the earth: and may there be sciniphs in all the land of Egypt. 17 And they did so. And Aaron stretched forth his hand, holding the rod: and he struck the dust of the earth, and there came sciniphs on men and on beasts: all the dust of the earth was turned into sciniphs through all the land of Egypt. 18 And the magicians with their enchantments practiced in like manner, to bring forth sciniphs, and they could not and there were sciniphs as well on men as on beasts. 19 And the magicians said to Pharao This is the finger of God. And Pharao heart was hardened, and he hearkened not unto them, as the Lord had commanded. 20 The Lord also said to Moses: Arise early, and stand before Pharao: for he will go forth to the waters: and thou shalt say to him: Thus saith the Lord: Let my people go to sacrifice to me.
16 "Sciniphs"... Or Cinifs, Hebrew Chinnim, small flying insects, very troublesome both to men and beast.