Sahih al-Bukhari Book 10, Hadith 96
Jabir bin `Abdullah said, "Mu`adh bin Jabal used to pray with the Prophet (ﷺ) and then go to lead his
people in prayer Once he led the `Isha' prayer and recited Surat "Al-Baqara." Somebody left the
prayer and Mu`adh criticized him. The news reached the Prophet (ﷺ) and he said to Mu`adh, 'You are
putting the people to trial,' and repeated it thrice (or said something similar) and ordered him to recite
two medium Suras of Mufassal." (`Amr said that he had forgotten the names of those Suras).
I used to pray the `Isha prayer with the Prophet (ﷺ) and then go to lead my people in the prayer.
A man came and said, "O Allah's Messenger (ﷺ)! By Allah, I keep away from the morning prayer only because So and so prolongs the prayer when he leads us in it." The narrator said, "I never saw Allah's Apostle more furious in giving advice than he was at that time. He then said, "Some of you make people dislike good deeds (the prayer). So whoever among you leads the people in prayer should shorten it because among them are the weak, the old and the needy."