To hurt Ali (ع) is to hurt the Prophet (ص)
عَنْ عُمَر بْنِ الْـخَطّاب: قَالَ: كُنْتُ أَجْفُو عَلِيّاً، فَلَقِيَني رَسُولُ اللهِ (صلی الله علیه و آله) فَقَالَ:
﴿ إِنَّكَ آذَيْتَنِي يَا عُمَر ﴾
فَقُلْتُ: أَعُوذُ بِاللهِ مِمَّنْ أَذَی رَسُولَهُ!
قَالَ: ﴿ إِنَّكَ قَدْ آذَيْتَ عَلِيّاً، وَمَنْ آذَی عَلِيّاً فَقَدْ آذَانِي ﴾
It is narrated from Omar-ibn-Khattab as saying: I was harsh with Ali (ع). One day, the Messenger of Allah (ص) met me and said:
"You have hurt me, Omar!"
I said: I seek refuge in Allah from those who offend His Messenger!
He said: “You have hurt Ali, and whoever hurts Ali has hurt me.”
Ibn Marduyeh Esfahani, Al-Manaqib, page 81; Ibn Sayyid al-Kull, Al-Anba 'Al-Mustataba, page 64; Rafe’ei Qazvini, Al-Tadvin fi Akhbar Qazvin, V.3, page 389.
And it is narrated from Husain ibn Ali that my father (Ali ibn Abi Talib) while holding a strand of his hair, mentioned to me this hadith that my grandfather, the Messenger of Allah (s.a.w.a.) while holding a strand of his hair said, “Whoever hurts you, as much a strand of your hair, he has in fact hurt me. Whoever hurts me, has really hurt God, and whoever hurts God, May Allah curse him to the extent of the earth and the sky." Iji, Tauzeeh ul-Dalayil, page 193.
