Praise be to Allaah.
What he must do is ask permission from the donors to dispose
of it as he wants on permissible or recommended things. It is not
permissible for him to collect charity or donations in the name of a
specific cause then spend it on something else, unless he does not know the
identities of the donors and has no means of contacting them. In that case
he must spend that charity on the closest cause to that for which he
collected it. So if a person collects money to build a mosque, then there is
extra money, he should spend it on building another mosque, and he should
not spend it on the poor and needy, for example.
This is what the brother who asked this question should do.
If it is possible for him to tell the one who donated a large amount about
the situation, and ask his permission to dispose of it, then he should do
that. Otherwise he may spend it on the web site and buy what is needed for
it.
The scholars of the Standing Committee for Issuing Fatwas
were asked:
I collected donations to build a mosque in the village, and
the mosque was built. Some good people donated money to complete the
interior, because the money that I had left was not sufficient for that. I
have some of the donations left. Is it acceptable to spend the leftover
donations on building fences for the Eid prayer place and graveyard in the
village? Is it acceptable to spend the extra funds on buying air
conditioners or furnishings for mosques in other villages? Is it acceptable
to spend the extra funds on helping those who want to get married or on the
poor and needy in the village? All of that is with the intention of the
reward going to the donors. Please note that the donors include both
villagers and outsiders.
They replied:
It is permissible for you to spend the remaining money that
you have left over from building the mosque that you supervised on building
another mosque, if the first mosque does not need that. It is not
permissible for you to spend the money mentioned on anything other than
building or maintaining mosques, because that is spending it on something
other than the purpose for which it was donated. End quote.
Fataawa al-Lajnah al-Daa’imah (al-Majmoo’ah
al-Thaaniyah, 5/208).
And Allaah knows best.