The ruling on adhering to what the testator specified in his bequest

Question: A man bequeathed a quarter of his wealth before his death to be distributed as follows: an 'Id sacrifice to be slaughtered for him every year, charity for the poor and the needy, acts of righteousness and channels of good. The wealth for which he bequeathed a quarter consists of real estate and small balances in some banks. My question is: Is it permissible to spend what he bequeathed solely on building a mosque, or must we adhere strictly to the items specified by the testator?

Answer: It is obligatory in such a bequest to adhere to what the testator mentioned. Likewise, in all lawful bequests, it is obligatory to adhere to what the testator mentioned and to carry it out as far as possible. And success is from Allah.