Chapter on Virtues of Hajj
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 2
وَ قَالَ اَلنَّبِيُّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «اَلنَّظَرُ إِلَى عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ عِبَادَةٌ».
The Prophet, peace and blessings be upon him and his family, said: "Looking at Imam Ali ibn Abi Talib عليه السلام is an act of worship."
- Ṣaḥīḥ al-Faqīh