(37) باب أَمْرِ الأَئِمَّةِ بِتَخْفِيفِ الصَّلاَةِ فِي تَمَامٍ
Abu Huraira reported:
The Messenger of Allah (ﷺ) said: When any one of you leads people in prayer, he must shorten it for among them are the weak, the infirm and those who have business to attend.
Reference: Sahih Muslim 467 c
In-book reference: Book 4, Hadith 210
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 944