Khusaylah bint Wathilah (may Allah have mercy on her) narrates that she heard her father say: I said: "O Messenger of Allah, what is partisanship ('asabiyyah)?" He (peace and blessings be upon him) said: "That you help your people in wrongdoing."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18456