al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
(وَ مِنْ هَذَا الْكِتَابِ) لِأَنَّهَا بَيْعَهٌ وَاحِدَةٌ لَا يُثَنَّى فِيهَا النَّظَرُ، وَلَا يُسْتَأْنَفُ فِيهَا الْخِيَارُ، الْخَارِجُ مِنْهَا طَاعِنٌ، وَالْمُرَوِّي فِيهَا مُدَاهِنٌ.
[A part of the same letter :] Because allegiance is once and for all; it is not open to reconsideration nor is there any scope for fresh proceedings of election. He who remains out of it is deemed to be critical of Islam while he who prevaricates upon it is a hypocrite.
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