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 Sahih Muslim 74 a
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ شُعْبَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ جَبْرٍ، قَالَ سَمِعْتُ أَنَسًا، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم "آيَةُ الْمُنَافِقِ بُغْضُ الأَنْصَارِ وَآيَةُ الْمُؤْمِنِ حُبُّ الأَنْصَارِ "
Translation
It is reported on the authority of Anas that the Messenger of Allah (may peace and blessings Be upon him) observed
The sign of a hypocrite is the hatred against the Ansar and the sign of a believer is the love for the Ansar.