Surah 25. Al-Furqan, Ayah 67

In the Qur'an, the verb anfaqa (and the corresponding noun nafaqah) has usually this connotation.

In ordinary spending this is a wise rule. But even in charity, in which we give of our best, it is not expected that we should be extravagant, i.e., that we should either do it for show, to impress other people, or do it thoughtlessly, which would be the case if we "rob Peter to pay Paul". We should certainly not be niggardly, but we should remember everyone's rights, including our own, and strike a perfectly just balance between them.