It is mentioned in the Hadith:
Translation: You instruct your children in 3 things. (1) Love of the Holy Prophet (Sallallahu alaihi wa sallam) (2) Love of the Prophet’s Family (3) Recitation of the Holy Quran. (Ithaaf Ul Khaira, Hadith No. 7753)
The Prophet’s Family – A means of safety for the Ummah
There is a Hadith in Sunan Dailami:
Translation: Ayaas bin Salama (May Allah be well pleased with him) narrates on the authority of his father who narrates that the Holy Prophet (Sallallahu alaihi wa sallam) said: Stars are the means of safety for the dwellers of the heavens and my family is the means of safety for my Ummah. (Mo’jam Kabeer Tabarani, Hadith No. 6137)
The very mention of the Prophet’s Family is a cure – Even lunatics are cured
There is a Hadith in Sunan Ibn Majah, Mo’jam Kabeer Tabarani and in Baihaqui:
Translation: It is narrated on the authority of Hadhrat ‘Ali bin Abu Talib (May Allah be well pleased with him) that the Holy Prophet (Sallallahu alaihi wa sallam) said: Faith is to believe from the heart, to affirm with the tongue and to fulfill the obligations.
The narrator of this Hadith, Hadhrat Abu Salat (May Allah be well pleased with him) says: If the chain of authority of this Hadith is recited and blown over a lunatic, the lunatic will be cured of lunacy. (Sunan Ibn Majah, Mo’jam Kabeer Tabarani, Baihaqui)
Now let us look at the chain of authority of this Hadith. All of them are from the Prophet’s Family:
Translation: It is narrated on the authority of Hadhrat ‘Ali bin Moosa Raza (May Allah be well pleased with him) who narrates on the authority of his father Hadhrat Moosa Raza (May Allah be well pleased with him) who narrates on the authority of Imam Ja’afar Sadiq (May Allah be well pleased with him) who narrates on the authority of his father Hadhrat Imam Muhammad Baquer (May Allah be well pleased with him) who narrates on the authority of Imam Zain Ul A’abideen (May Allah be well pleased with him) who narrates on the authority of Imam Hussain (May Allah be well pleased with him) who narrates on the authority of Hadhrat Ali bin Abi Talib (May Allah be well pleased with him) who narrates that the Holy Prophet (Sallallahu alaihi wa sallam) said: Faith is to believe from the heart, to affirm with the tongue and to fulfill the obligations.