The ruling on specifying a fixed duration for a waqf (endowment) and making that a condition
Machine translationRead the Arabic original
The questioner : He wants to take it for ten years, and then after that, he takes it back from the subject.
The Shaykh : That does not happen.
The questioner : If Allah wills.
The Shaykh : Yes, and he has a condition, but he makes it an 'Umrah (lesser pilgrimage), saying, "It is yours as long as you remain, for example." As for making it a waqf (endowment), that is not allowed; the waqf is, they say, of the nature of permanent things, and one does not have the right to revoke it.
The Shaykh : That does not happen.
The questioner : If Allah wills.
The Shaykh : Yes, and he has a condition, but he makes it an 'Umrah (lesser pilgrimage), saying, "It is yours as long as you remain, for example." As for making it a waqf (endowment), that is not allowed; the waqf is, they say, of the nature of permanent things, and one does not have the right to revoke it.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، [5552] حكم توقيت الوقف لمدة معينة واشتراط ذلك - تعليقات على الكافي لابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.