What is the criterion for hardship that permits sitting in prayer?

Question : But is the hardship defined by a specific criterion or not? Because some people may sometimes be in a state of fatigue and sleeplessness.

Answer : It becomes difficult for them to stand. We say that the criterion for hardship is that the khushu' (reverence) remains with them. The khushu' remains with them. This is hardship. And what is meant by khushu'? It means the presence of the heart and tranquility. So if a person stands and feels extreme anxiety and cannot find peace, and you find him wishing to reach the end of al-Fatihah so he can bow because of the intensity of his endurance, then standing has become difficult for him. He prays sitting down. He prays sitting down.