Exodus 10:21 And the Lord said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt. 22 And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days.
[Patriarchs & Prophets pp 272] The Hebrew slaves, so miraculously favored, were becoming confident of deliverance. Their taskmasters dared not oppress them as heretofore. Throughout Egypt there was a secret fear that the enslaved race would rise and avenge their wrongs. Everywhere men were asking with bated breath, What will come next?
Suddenly a darkness settled upon the land, so thick and black that it seemed a “darkness which may be felt.” Not only were the people deprived of light, but the atmosphere was very oppressive, so that breathing was difficult. “They saw not one another, neither rose any from his place for three days: but all the children of Israel had light in their dwellings.”
The sun and moon were objects of worship to the Egyptians; in this mysterious darkness the people and their gods alike were smitten by the power that had undertaken the cause of the bondmen. Yet fearful as it was, this judgment is an evidence of God's compassion and His unwillingness to destroy. He would give the people time for reflection and repentance before bringing upon them the last and most terrible of the plagues.
Exodus 10:23 They saw not one another, neither rose any from his place for three days: but all the children of Israel had light in their dwellings.
May God add His blessing to the study of His word. “Good night” and God bless!