Sahih Muslim
Sahih Muslim 74 b
Evidence that love of the Ansar and Ali (r.a.) is a part of faith and a sign thereof; Hating them is a sign of hypocrisy
Arabic hadith text
حَدَّثَنَا يَحْيَى بْنُ حَبِيبٍ الْحَارِثِيُّ، حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ الْحَارِثِ - حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ "حُبُّ الأَنْصَارِ آيَةُ الإِيمَانِ وَبُغْضُهُمْ آيَةُ النِّفَاقِ "
Translation
It is narrated on the authority of Anas that the Apostle (may peace and blessings be upon him) said
The love of the Ansar is the sign of faith and hatred against them is the sign of dissemblance.