The Prophet (peace and blessings be upon him) said: Whoever reviles Ali has reviled me

It is narrated from Abu Abdullah al-Jadali that he said: I came into the presence of Sayyidah Umm Salamah (may Allah be pleased with her), and she asked me: "Is the Messenger of Allah (peace and blessings be upon him) being reviled among you?" I said: Allah forbid! (or Subhan Allah, or some similar phrase). She said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever reviles Ali has reviled me."
This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs did not record it, while Bukayr bin Uthman al-Bajali has also narrated it from Abu Ishaq with some additional words:

It is narrated from Abu Abdullah al-Jadali that he said: I performed Hajj as a boy and passed through Madinah, and I saw the people going in crowds in one direction. I followed them, and they came to the Mother of the Believers Sayyidah Umm Salamah (may Allah be pleased with her). I heard her say: "O Shabath bin Rib'i!" (That coarse, ill-mannered man replied: O mother! Here I am.) She asked: "Is the Messenger of Allah (peace and blessings be upon him) being reviled in your gatherings?" He said: "How could that be?" She said: "Is Ali bin Abi Talib not reviled (in your gatherings)?" He said: "We say such things (against him) for the sake of worldly gain." She said: "Indeed, I heard the Messenger of Allah (peace and blessings be upon him) say: 'Whoever reviles Ali has reviled me, and whoever reviles me has reviled Allah Almighty.'"