The sign of a hypocrite is the hatred against the Ansar and the sign of a believer is the love for the Ansar.
Sahih Muslim Book 1, Hadith 141
← Previous Hadith Some people entered the morning with gratitude and some with ingratitude (to Allah). Those who entered with gratitude said: This is the blessing of Allah, and those who entered with ingratitude said: Such and such asterism was right. It was upon this that the verse was revealed: I swear by the setting of the stars to the end and make your provision that you should disbelieve it.

Sahih Muslim Book 1, Hadith 140 Next Hadith → The love of the Ansar is the sign of faith and hatred against them is the sign of dissemblance.

Sahih Muslim Book 1, Hadith 142