Ibn Asaker, Tarikh Madinah-Damishq, V.42, page 359; Zahabi, Mizan al-Ehtedal V.1, page 484; Ibn Hajar Asqalani, Lisan al-Mizan, V.2, page 199; Nazm Durar al-Simtayn, page 90; Ibn Marduyeh Esfahani, Manaqib, page 265-267. Also, refer to Suyuti, Al-Durr al-Manthur, V.4, page 45; Alusi, Ar-Ruh al-Ma’ani, V.13, page 108; Tabari, Jami al-Bayan, V.13, page 142.

This hadith is one of the famous hadiths and about it, Suyuti in Al-Durr al-Manthur says: This hadith has been narrated by Ibn Jarir, Ibn Marduyeh, Abu Naim in Al-Ma’rifeh, Dailami, Ibn Asaker and Ibn Najjar.

As the verse إِنَّمَا أَنْتَ مُنْذِرٌ وَ لِكُلِّ قَوْمٍ هَادٍ “You are truly a warner, and to every nation there is a guide” (Ra’ad, 7) was revealed, the holy Prophet (s.a.w.a.) placed his blessed hand on his chest and said, “I am the warner”. Then he placed his hand on Ali’s chest and said, ‘O Ali! You are the guide and those who are guided after me will be guided through you’.

Also, he has narrated the same from Abi Barzah, Ibn Marduyeh, Zia in Al-Mukhtarah from Ibn Abbas and from Abdullah ibn Ahmad in Zawaed al-Musnad, Ibn Abi Hatam and Tabarani in Al-Awsat and Hakim and considered it as authentic. Refer to Suyuti, Al-Durr al-Manthur, V.4, page 45.

Ibn Marduyeh and Ibn Asaker have narrated from Ali-ibn-Abi Talib (s.a.w.a.) that with regards to the verse:

 إِنَّمَا أَنْتَ مُنْذِرٌ وَ لِكُلِّ قَوْمٍ هَادٍ  he said, “The Messenger of Allah is the warner, and I am the guide”. Ibn Maduyeh Esfahani, Manaqib, page 267, Ibn Asaker, Tarikh Madinah-Damishq, V.42, page 359.