Hadith 31-305

وَبِإِسْنادِهِ قالَ: قالَ النَّبِيُ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: كُفَّ عَلِيٍّ كَفِّي.

According to the same documentation,the Prophet (S) said, “Ali’s hand is the same as my hand.” [88]

[88] This implies that making a pledge of allegiance to Ali (a.s.) is equal to making a pledge of allegiance to God’s Prophet (S).