The Definition of Collective Obligation (Fard Kifayah)
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Question:
He says: Honorable Shaykh, may Allah grant you success, is it correct to say that the collective obligation (fard kifayah) is the obligation that if some people perform it, the sin drops from the rest, and if they all leave it, the sin is only on those who are able?
Answer:
The collective obligation (fard kifayah) is that which, if those who are sufficient perform it, the sin drops from the rest, and if everyone leaves it, they all sin. Yes.
He says: Honorable Shaykh, may Allah grant you success, is it correct to say that the collective obligation (fard kifayah) is the obligation that if some people perform it, the sin drops from the rest, and if they all leave it, the sin is only on those who are able?
Answer:
The collective obligation (fard kifayah) is that which, if those who are sufficient perform it, the sin drops from the rest, and if everyone leaves it, they all sin. Yes.
Source
شرح كتاب المنتقى من أخبار المصطفى صلى الله عليه وسلم، بداية من باب حضور النساء المساجد وفضل صلاتهن في بيوتهن — islamhouse.com (1:09:03)
The Arabic text is a machine transcription of the audio recording.