Sayyiduna Anas bin Malik رضي الله عنه narrates that when the Noble Prophet صلى الله عليه وآله وسلم came to Madinah, it was a place afflicted with fever, so people became ill. When the Noble Prophet صلى الله عليه وآله وسلم came to the mosque and saw that people were sitting and praying, he صلى الله عليه وآله وسلم said: (In terms of reward) the prayer of one who sits is half the prayer of one who stands. So, the people began to perform the prayer standing with difficulty.