ʿUyūn akhbār al-Riḍā
Hadith 309309 - وَبِإِسْنادِهِ قالَ: قالَ النَّبِيُ صَلَّى اللهُ عَلَيْهِوَآلِهِ: مَن سَبَّ عَلِيّاً، فَقَدْ سَبَّني وَمَن سَبَّني فَقَدْ سَبَّ اللَّه.
31-309 According to the same documentation, the Prophet (S) said, “Whoever swears at Ali has indeed sworn at me, and whoever swears at me has indeed cursed God.”