The sign of a hypocrite is the hatred against the Ansar and the sign of a believer is the love for the Ansar. (Using translation from Muslim 74a)  

قَالَ رَسُولُ اللهِ ﷺ «آيَةُ الْمُنَافِقِ بُغْضُ الْأَنْصَارِ وَآيَةُ الْمُؤْمِنِ حُبُّ الْأَنْصَارِ»