أَخْبَرَنَا مُحَمَّدُ بْنُ حُمَيْدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ مُغِيرَةَ، قَالَ: "كَانَ عَامِرٌ إِذَا سُئِلَ عَنْ شَيْءٍ، يَقُولُ: لَا أَدْرِي، فَإِنْ رُدُّوا عَلَيْهِ، قَالَ: إِنْ شِئْتَ كُنْتُ حَلَفْتُ لَكَ بِاللَّهِ إِنْ كَانَ لِي بِهِ عِلْمٌ".
It is narrated from Sayyiduna Mughira (may Allah be pleased with him) that when Sayyiduna Amir al-Sha'bi (may Allah be pleased with him) was asked about something, he would say «لا أدري» (I do not know). If he was asked again, he would say firmly: I swear by Allah for you, if I had knowledge of it (that is, by Allah, I do not have knowledge of it).