Abdur Rahman bin Amr Salmi and Hajar bin Hajar Kalai (may Allah have mercy on them) say: We went to Sayyiduna Irbad bin Sariyah (may Allah be pleased with him), he was among those about whom this verse was revealed: «وَلَا عَلَی الَّذِیْنَ اِذَا مَآ اَتَوْکَ لِتَحْمِلَہُمْ قُلْتَ لَآ اَجِدُ مَآ اَحْمِلُکُمْ عَلَیْہِ» (There is no blame upon those who come to you so that you may provide them with mounts, and you say, "I do not find anything to carry you upon.") (Surah Tawbah: 92) We greeted him and said: "We have come to visit you, to inquire about your health, and to benefit from your knowledge." Sayyiduna Irbad (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) led us in the Fajr prayer one day, then turned to us and gave us such an effective and eloquent sermon that eyes wept and hearts trembled. One of the people said: "O Messenger of Allah! This seems like a farewell sermon, so what do you advise us?" He (peace and blessings be upon him) said: "I advise you to fear Allah, and to listen and obey (your leaders), even if he is an Abyssinian slave. For indeed, whoever among you lives after me will see much disagreement, so adhere to my Sunnah and the Sunnah of the rightly guided Caliphs, hold onto it firmly, and beware of newly invented matters, for every innovation is a misguidance."