Sayyiduna al-Harith bin Ziyad (may Allah be pleased with him), who was one of the people of Badr, said: The Messenger of Allah (peace and blessings be upon him) said: "Whoever loves the Ansar, Allah will love him until he meets Him; and whoever hates the Ansar, Allah will hate him until he meets Him."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3344