عن أبي هريرة رضي الله عنه مرفوعًا: «إذا صلى أحدكم للناس فَلْيُخَفِّفْ فإن فيهم الضعيف والسَّقِيمَ وذَا الحاجة، وإذا صلى أحدكم لنفسه فَلْيُطَوِّلْ ما شاء».
The Prophet (may Allah's peace and blessings be upon him) commanded the Muslims to shorten the prayer according to what is in the Sunnah. He justified that by saying that the weak people, as well as the sick and busy people, pray behind them. However, when they pray individually, they are free to either prolong or shorten the prayer as they wish.
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