Exodus 8:5 And the Lord spake unto Moses, Say unto Aaron, Stretch forth thine hand with thy rod over the streams, over the rivers, and over the ponds, and cause frogs to come up upon the land of Egypt. 6 And Aaron stretched out his hand over the waters of Egypt; and the frogs came up, and covered the land of Egypt.
[Patriarchs & Prophets pp 265>266] Again the rod was stretched out over the waters, and frogs came up from the river and spread over the land. They overran the houses, took possession of the bed chambers, and even the ovens and kneading troughs. The frog was regarded as sacred by the Egyptians, and they would not destroy it; but the slimy pests had now become intolerable. They swarmed even in the palace of the Pharaohs, and the king was impatient to have them removed. The magicians had appeared to produce frogs, but they could not remove them. Upon seeing this, Pharaoh was somewhat humbled.
He sent for Moses and Aaron, and said, “Entreat the Lord, that He may take away the frogs from me, and from my people; and I will let the people go, that they may do sacrifice unto the Lord.” After reminding the king of his former boasting, they requested him to appoint a time when they should pray for the removal of the plague. He set the next day, secretly hoping that in the interval the frogs might disappear of themselves, and thus save him from the bitter humiliation of submitting to the God of Israel. The plague, however, continued till the time specified, when throughout all Egypt the frogs died, but their putrid bodies, which remained, polluted the atmosphere.
The Lord could have caused them to return to dust in a moment; but He did not do this lest after their removal the king and his people should pronounce it the result of sorcery or enchantment, like the work of the magicians. The frogs died, and were then gathered together in heaps. Here the king and all Egypt had evidence which their vain philosophy could not gainsay, that this work was not accomplished by magic, but was a judgment from the God of heaven.
Exodus 8:12 And Moses and Aaron went out from Pharaoh: and Moses cried unto the Lord because of the frogs which he had brought against Pharaoh. 13 And the Lord did according to the word of Moses; and the frogs died out of the houses, out of the villages, and out of the fields. 14 And they gathered them together upon heaps: and the land stank.
May God add His blessing to the study of His word. "Good night" and God bless!