Spending a Friend's Money Without His Knowledge
Question :
Is it permissible for me, when in need, to spend my brother Muslim's money without his knowing, especially when I know with certainty that, were he present at the time, he would have been pleased to help me out?
Answer:
It is better for you to respect your brother's wealth, even if you are sure that he would have consented had he been present, because a Muslim's wealth is sacred. But if you need to take from your friend's wealth, and if you are sure that he would be pleased to give that wealth to you, then you may do so. For example, you are having guests over, and your friend owns some sheep, so you use one to entertain your guests, knowing that your friend would be pleased with your action; in this case, there is no harm. When you don't absolutely need to take his things or his money, then it is better not to take from your friend without his knowledge, even if you are sure of his being pleased, because even though he may be pleased with that, he will still be upset for what you did.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 8 Pages 403-404
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