al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
٣٤٨. وَقَالَ (عليه السلام): أَشدُّ الذُّنُوبِ مَا اسْتَهَانَ بِهِ صَاحِبُهُ.
348. Amīr al-mu’minīn, peace be upon him, said: The most serious sin is that which the doer considers light. [1]
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