Is it obligatory to liberate land that the disbelievers occupied after the Muslims had conquered it?
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Question:
He says: Honorable Shaykh, may Allah grant you success. He says: Is it true that if the Muslims conquer a land and then the disbelievers occupy it afterwards, it is obligatory for the Muslims to liberate it?
Answer:
To the extent of their ability. So if the Muslims conquered it and then they are able to liberate it for Islam, this is obligatory. Yes.
He says: Honorable Shaykh, may Allah grant you success. He says: Is it true that if the Muslims conquer a land and then the disbelievers occupy it afterwards, it is obligatory for the Muslims to liberate it?
Answer:
To the extent of their ability. So if the Muslims conquered it and then they are able to liberate it for Islam, this is obligatory. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/2030] هل يجب تحرير الأرض التي احتلها الكفار بعد فتح المسلمين لها؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.