There is a Hadith in Mustadrak ‘Alas Sahihain:
Translation: It is narrated on the authority of Hadhrat ‘Ali (May Allah be well pleased with him), he says: The Holy Prophet (Sallallahu alaihi wa sallam) told me that (along with Him), the first to enter paradise will be me and Fatima and Hasan and Hussain (May Allah be well pleased with them). I asked: O Prophet of Allah (Sallallahu alaihi wa sallam)! What about those who love us? The Holy Prophet (Sallallahu alaihi wa sallam) said: They will be following you. Imam Hakim has said that the chain of authority of this Hadith is rigorously authenticated. (Mustadrak ‘Alas Sahihain, Hadith No. 476)
Glad tidings of intercession for those who love the Prophet’s Family
The Holy Prophet, the intercessor of the sinners (Sallallahu alaihi wa sallam) said:
Translation: My intercession is for those privileged people of the Ummah, who love my Family. (Kanz Ul ‘Ummal, Hadith No. 34179)
There is another Hadith in Kanz Ul ‘Ummal:
Translation: There are 4 lucky people for whom I will intercede (i.e. perform Shafa’ah) on the Day of Judgment.
1. One who respects my Family.
2. One who offers them what they need.
3. One who manages their affairs when they need it.
4. One who loves them with his tongue and heart. (Kanz Ul ‘Ummal, Hadith No. 34180)
There is a Hadith in Mo’jam Tabarani:
Translation: It is narrated on the authority of Hadhrat Hasan bin ‘Ali (May Allah be well pleased with them) that the Holy Prophet (Sallallahu alaihi wa sallam) said: Make the love of the Prophet’s Family compulsory for yourself! The person who is presented in the court of Allah Most High in a state that our love is in his (or her) heart, that person will enter paradise through our intercession. By Him who holds my life in His power! No good deed will benefit a bondsman but only after they accept out superiority and excellence. (Mo’jam Ausat Tabarani, Hadith No. 2320)