أَخْبَرَنَا عَمْرُو بْنُ عَوْنٍ، أَخْبَرَنَا هُشَيْمٌ، عَنْ الْعَوَّامِ، عَنْ الْمُسَيَّبِ بْنِ رَافِعٍ، قَالَ: "كَانُوا إِذَا نَزَلَتْ بِهِمْ قَضِيَّةٌ لَيْسَ فِيهَا مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَثَرٌ، اجْتَمَعُوا لَهَا وَأَجْمَعُوا، فَالْحَقُّ فِيمَا رَأَوْا، فَالْحَقُّ فِيمَا رَأَوْا" . .
Musayyib bin Rafi’ said that when people faced an issue about which there was no narration from the Messenger of Allah (peace be upon him), then all of them would gather for it and consensus (ijma’) would be established, and the truth is what their opinion would be; the truth is that upon which they established consensus.