Isaiah 50:3

3.I clothe the heavens with blackness. He mentions also that thick darkness which was spread over all Egypt during the space of three days. (Exodus 10:22.) At that time the heaven was clothed as with a mouming dress; for, as fine weather has a gladdening influence, so blackness and darkness produce melancholy; and therefore he says, that the heavens were covered as with sackcloth or with a mouming dress, as if they had been tokens and expressions of mouming, (15) If any one prefer to view them as general statements, let him enjoy his opinion; but I think it probable that he glances at the history of the deliverance from Egypt, (16) front which it might easily be inferred that God, who had so miraculously assisted the fathers, was prevented by their ingratitude from granting relief to the miseries which now oppressed them.