Hadith 31-216

وَبِإِسْنادِهِ قالَ: قالَ رَسُولَ اللَّهِ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: مَن أَحَبَّ أَن يَتَمَسَّك بِالعُروَة الوُثقى‏ فَليَتَمَسَّكَ بِحُبِّ عَلِيِّ وَأَهْلِ بَيْتِي.

According to the same documentation, God’s Prophet (S) said, “Whoever likes to grab a Reliable Grip should turn to the love for Ali (a.s.) and the members of my Household.”