I say: Rather the sunnah is what the Prophet ﷺ made so, or the | IlmTest

I say: Rather the sunnah is what the Prophet ﷺ made so, or the Rightly-Guided Caliphs after him.
قُلْتُ: بَلِ السُّنَّةُ: مَا سَنَّهُ النَّبِيُّ -صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ- وَالخُلَفَاءُ الرَّاشِدُوْنَ مِنْ بَعْدِهِ،

As regards al-ijmāʿ (ie: consensus), it is whatever the scholars of this ummah, both past and present, have unanimously concurred upon: (including) a consensus which is dhannī (ie: speculative) or sukutī (ie: tacit).
وَالإِجْمَاعُ: هُوَ مَا أَجْمَعَتْ عَلَيْهِ عُلَمَاءُ الأُمَّةِ قَدِيْماً وَحَدِيْثاً، إِجْمَاعاً ظَنِّياً أَوْ سُكُوتِيّاً،

Whosoever diverges from such a consensus, among al-tābiʿūn (ie: Successors) or their followers – due to stances arrived at via al-ijtihād (ie: independent legal judgement) – it is tolerated from him alone.
فَمَنْ شَذَّ عَنْ هَذَا الإِجْمَاعِ مِنَ التَّابِعِيْنَ، أَوْ تَابِعِيْهِم لِقَوْلٍ بِاجْتِهَادِه، احْتُمِلَ لَهُ،

As for those who disagree with the three aforementioned senior scholars, then this is not considered to be opposing the consensus, nor the Sunnah.
فَأَمَّا مَنْ خَالَفَ الثَّلاَثَةَ المَذْكُوْرِيْنَ مِنْ كِبَارِ الأَئِمَّةِ، فَلاَ يُسَمَّى مُخَالِفاً لِلإِجْمَاعِ، وَلاَ لِلسُّنَّةِ،

All that Isḥāq intended was that if they concur upon any given matter, then it is most probably correct.
وَإِنَّمَا مُرَادُ إِسْحَاقَ: أَنَّهُم إِذَا اجْتَمَعُوا عَلَى مَسْأَلَةٍ، فَهُوَ حَقٌّ غَالِباً،

Just as we say today that it is almost impossible to find the truth to be outside of whatever the four mujtahid Imāms concurred upon. We say this whilst at the same time admitting that their agreement on an issue does not constitute a consensus of the ummah: though we are wary of stating in an issue on which they agree, that the truth is otherwise.
كَمَا نَقُوْلُ اليَوْمَ: لاَ يَكَادُ يُوجَدُ الحَقُّ فِيْمَا اتَّفَقَ أَئِمَّةُ الاجْتِهَادِ الأَرْبَعَةُ عَلَى خِلاَفِه، مَعَ اعْتِرَافِنَا بِأَنَّ اتِّفَاقَهُم عَلَى مَسْأَلَةٍ، لاَ يَكُوْنُ إِجْمَاعَ الأُمَّةِ، وَنَهَابُ أَنْ نَجْزِمَ فِي مَسْأَلَةٍ اتَّفَقُوا عَلَيْهَا، بِأَنَّ الحَقَّ فِي خِلاَفِهَا.

al-Ḏahabī, Siyar Aʿlām al-Nubalāʾ 7/116
الذهبي، سير أعلام النبلاء ٧/١١٦
https://shamela.ws/index.php/book/10906

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