Israf

Also termed as tabdheer, it is over-indulgence and can be in anything including virtuous deeds. Many conditions are attached, however. If someone were to spend in the way of Allah until left a pauper, seeking Allah ’s pleasure, he would not be committing Israf, if his dependents give consent, and he himself does not have any regret in his heart. On the other hand, the littlest one can spend, but which does not please Allah , is Israf. One of the Salaf was chided for spending heavily in a good cause. He was told, “There is no good in Israf.” He replied, “There is no Israf in good.” The Prophet said to Asma’ bint Abi Bakr: “Spend: this way and that way. Do not save back, or Allah will hold back on you. And do not count, or Allah will count on you.”
Similarly, over-spending one’s personal time over an affair, using extra water for ablution, feeding a people already well-fed, etc., are all Israf.
Where lies the boundary? The answer is, one may follow his own judgment. It is explained that if you eat more than the essential, that which sickness your body and prevents you from devotion to Allah is Israf while if you eat less, despite the availability, weakening your body and affecting your devotional acts to Allah , then it is Iqtar (Israf in reverse), while it is Israf that one should eat all that he desires.

No Israf in Good One of the Salaf was chided for spending heavily in a good cause. He was told, “There is no good in Israf” (overspending). He replied, “There is no Israf in good.”