Pope Shenouda III
Another example is the fast of the people of Nineveh.
All the people, even children and babies, fasted and neither ate nor drank anything, They did not stop at that but humbled themselves before God, covering themselves with sackcloth and ashes. Even the King himself removed his crown and royal attire, did not sit on his throne but sat with the people on sackcloth and in ashes and they all cried mightily unto God. (Jon 3).
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