Sahih Muslim Book 1, Hadith Number 137.

Chapter : The love of Ansar (helpers) and ‘All (may Allah be pleased with all of them) is (an Ingredient) of Iman and (one of) its signs, and hatred against them is a sign of dissemblance.

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.