Exodus 7:19 And the Lord spake unto Moses, Say unto Aaron, Take thy rod, and stretch out thine hand upon the waters of Egypt, upon their streams, upon their rivers, and upon their ponds, and upon all their pools of water, that they may become blood; and that there may be blood throughout all the land of Egypt, both in vessels of wood, and in vessels of stone.
[Patriarchs & Prophets pp 265>266] The sacred stream ran blood, the fish died, and the river became offensive to the smell. The water in the houses, the supply preserved in cisterns, was likewise changed to blood. But “the magicians of Egypt did so with their enchantments,” and “Pharaoh turned and went into his house, neither did he set his heart to this also.” For seven days the plague continued, but without effect. 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.
Exodus 7:24 And all the Egyptians digged round about the river for water to drink; for they could not drink of the water of the river. 25 And seven days were fulfilled, after that the Lord had smitten the river.
May God add His blessing to the study of His word. “Good night” and God bless!