Purchasing a used book that bears the seal of waqf (endowment)

The Shaykh:
This is the prayer that does not become valid if one intentionally delays it outside its prescribed time without an excuse, such as intending to combine it with the following prayer when combining is permissible for him. It is not permissible to delay a prayer outside its time except for one who intends to combine it, provided that combining is permissible for him.

The questioner:
He says: Honorable Shaykh, may Allah grant you success, what is the ruling on purchasing a used book that bears the seal of waqf (endowment), indicating that it is an endowment for Allah for the students of knowledge?

The Shaykh:
It is not permissible. As long as it bears the seal of an endowment for Allah for the students of knowledge, it is not permissible. However, if you are in need of it and can benefit from it, that is one thing; but if you do not need it, you should give it to another student of knowledge. Yes.