On forbidding attacking someone's lineage

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

275. Chapter: On forbidding attacking someone's lineage

Allah Almighty says, "And those who abuse believing men and woman, when they have not merited it, bear the weight of slander and clear wrongdoing." (33:58)

1578. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Two things people do have disbelief in them: attacking lineage and wailing over the dead." [Muslim]