Ibn Hisham reported: Abu Bakr, may Allah be pleased with him, began to speak at his inauguration, praising Allah as He deserves and saying, “O people, I have been put in authority over you and I am not the best of you. If I do the right thing, then help me. If I do wrong, then correct me. Truthfulness is a sacred trust and lying is a betrayal. The weak among you is strong in my sight. I will surely try to remove their pain and suffering. And the strong among you is weak to me. I will, if Allah wills, fulfill the rights in full. When obscene things spread among any nation, calamities continue to descend upon them. As long as I obey Allah and His messenger, you should obey me. If I do not obey Allah and His messenger, then obedience to me is not an obligation upon you. Now, stand for the prayer, may Allah have mercy upon you.”
Source: al-Sīrah al-Nabawīyah 2/661
عن ابن هشام تَكَلَّمَ أَبُو بَكْرٍ رضي الله عنه فَحَمِدَ اللَّهَ وَأَثْنَى عَلَيْهِ بِاَلَّذِي هُوَ أَهْلُهُ ثُمَّ قَالَ أَمَّا بَعْدُ أَيُّهَا النَّاسُ فَإِنِّي قَدْ وُلِّيتُ عَلَيْكُمْ وَلَسْتُ بِخَيْرِكُمْ فَإِنْ أَحْسَنْتُ فَأَعِينُونِي وَإِنْ أَسَأْتُ فَقَوِّمُونِي الصَّدْقُ أَمَانَةٌ وَالْكَذِبُ خِيَانَةٌ وَالضَّعِيفُ فِيكُمْ قَوِيٌّ عِنْدِي حَتَّى أُرِيحَ عَلَيْهِ حَقَّهُ إنْ شَاءَ اللَّهُ وَالْقَوِيُّ فِيكُمْ ضَعِيفٌ عِنْدِي حَتَّى آخُذَ الْحَقَّ مِنْهُ إنْ شَاءَ اللَّهُ لَا يَدَعُ قَوْمٌ الْجِهَادَ فِي سَبِيلِ اللَّهِ إلَّا ضَرَبَهُمْ اللَّهُ بِالذُّلِّ وَلَا تَشِيعُ الْفَاحِشَةُ فِي قَوْمٍ قَطُّ إلَّا عَمَّهُمْ اللَّهُ بِالْبَلَاءِ أَطِيعُونِي مَا أَطَعْتُ اللَّهَ وَرَسُولَهُ فَإِذَا عَصَيْتُ اللَّهَ وَرَسُولَهُ فَلَا طَاعَةَ لِي عَلَيْكُمْ قُومُوا إلَى صَلَاتِكُمْ يَرْحَمُكُمْ اللَّهُ
2/661 السيرة النبوية لابن هشام أمر سقيفة بني ساعدة خطبة أبي بكر