It is narrated from Sayyiduna Ali (may Allah be pleased with him) that Sayyiduna Mu'adh (may Allah be pleased with him) led his people in the Fajr prayer and recited Surah al-Baqarah in it. Behind him there was a Bedouin man taking part in the prayer, who had his water-carrying camel with him. When the second rak'ah came, the Bedouin (separated from the congregation and) offered his prayer alone, leaving Sayyiduna Mu'adh (may Allah be pleased with him). The people informed the Prophet (peace and blessings be upon him) of this, and the man said (by way of excuse): "I feared my water-carrying camel would be lost, and I have the responsibility of a family for whom I strive to earn." At this the Prophet (peace and blessings be upon him) said: "Lead them in prayer according to the capacity of the weakest among them, for among them are the young, the elderly and those with needs. Do not be one who puts people to trial (fitnah)."
The chain of this report of Ahmad bin Mani' is da'if (weak) because of al-Asbagh bin Nubatah; however, the basis of this incident is established in Sahih al-Bukhari and Sahih Muslim through other reliable chains, where the Prophet (peace and blessings be upon him) admonished Sayyiduna Mu'adh (may Allah be pleased with him) for a long recitation in the Isha prayer.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصلاة / 422
Hadith Gradingمحدثین:إسناده ضعيف جدًا
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف جدًا. » «انفرد به المصنف من هذا الطريق»