(Ameerul Momenin (A.S) In Quran(1

surah Al –bagharah , ayat 40 

یَا بَنِی إِسْرَائِیلَ اذْکُرُوا نِعْمَتِیَ الَّتِی أَنْعَمْتُ عَلَیْکُمْ وَأَوْفُوا بِعَهْدِی أُوفِ بِعَهْدِکُمْ وَإِیَّایَ فَارْهَبُونِ


 "Be faithful to your promise with Me and I will fulfill My promise with you"  
Sama bin Mahran narrates, "I asked Imam Abu Abdullah Sadiq (as) regarding this ayah,
Imam (as) said, "That promise of Allah is wilayat e Ali (asws).
 It is wajib upon you from Allah. Fulfill it and Allah will fulfill His promise of jannah with you."

Tafseer e Ayyashi First Edition pg 60