عَنِ ابْنِ عَبَّاسٍ قَالَ قَالَ رَسُولُ اللهِ ﷺ يَا عَلِيُّ اِنَّ جَبْرَئِيلَ اَخْبَرَنِي فِيكَ بِاَمْرٍ قَرَّتْ بِهِ عَيْنِي وَ فَرِحَ بِهِ قَلْبِي قَالَ لِي يَا مُحَمَّدُ اِنَّ اللهَ تَعَالٰى قَالَ لِي اَقْرِءْ مُحَمَّدًا مِنِّي السَّلَامَ وَ اَعْلِمْهُ اَنَّ عَلِيًّا اِمَامُ الْهُدَى وَ مِصْبَاحُ الدُّجَى وَ الْحُجَّةُ عَلَى اَهْلِ الدُّنْيَا فَاِنَّهُ الصِّدِّيقُ الْاَكْبَرُ وَ الْفَارُوقُ الْاَعْظَمُ وَ اِنِّي آلَيْتُ بِعِزَّتِي اَنْ لَا اُدْخِلَ النَّارَ اَحَدًا تَوَلَّاهُ وَ سَلَّمَ لَهٗ وَ لِلْاَوْصِيَاءِ مِنْ بَعْدِهِ وَ لَا اُدْخِلَ الْجَنَّةَ مَنْ تَرَكَ وَلَايَتَهُ وَ التَّسْلِيمَ لَهٗ وَ لِلْاَوْصِيَاءِ مِنْ بَعْدِهِ وَ حَقَّ الْقَوْلُ مِنِّي لَاَمْلَاَنَّ جَهَنَّمَ وَ اَطْبَاقَهَا مِنْ اَعْدَائِهٖ وَ لَاَمْلَاَنَّ الْجَنَّةَ مِنْ اَوْلِيَائِهٖ وَ شِيعَتِهٖ
Ibn Abbas reports that the Messenger of Allah (peace be on him and his progeny) said,
“O Ali! Verily, (the archangel) Jibraeel informed me about you a command due to which my eyes were soothed and my heart became joyous. He said to me, ‘O Muhammad! Surely, Allah the High told me, ‘Convey my greetings to Muhammad and inform him that undoubtedly Ali (peace be on him) is the leader of guidance, the lamp in darkness and the divine proof upon the people of the world. Surely, he (peace be on him) is the greatest verifier (of truth) and the supreme distinguisher (between truth and falsehood). I have taken an oath by My Mighty that I will not make anyone enter the hell-fire who accepts his (peace be on him) mastership and submits to him as well as the successors after him. And I will not cause to enter Paradise whoever leaves his mastership and refuses to submit to him and the successors after him. I hereby promise that I will certainly stuff the hell-fire and its levels with his (peace be on him) enemies and I will surely fill the heaven with his friends and followers’.”
References:
1. Al-Tahseen by Sayed Ibn Taawoos (r.a.), p. 122, Chapter 19
2. Meah Manqebah, p. 56, 30th Virtue
3. Behaar al-Anwaar, vol. 27, p. 113, H. 88