Permissibility of spending the revenues of Waqf on charity according to the Waqf administrator's discretion

Q: My wife and I bought a she-camel and we each paid half the price. My wife intended the half which she owns for the sake of Allah (Exalted be He) and I did the same. My wife assigned her half as Waqf for her offspring by me, but they have died. After the she-camel had delivered a calf, I gave it to a grazer but it ran away. I estimated their value to be 450 Riyals. Now I do not know what I should do concerning the value of the calf as well as that of the mother.

A: The revenue of temporary waqf should be spent in charitable ways. This Waqf has come to an end on the death of its beneficiary. So, its principal shall remain and the revenue will be spent in (Part No. 16; Page No. 142) charitable ways under the supervision of the Waqf administrator. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.