Sahih Muslim
The Book of Zakat (Kitab Al-Zakat)
Book Number: 005 / Hadith Number: 2190
Umm Salama said: I asked the Messenger of Allah (may peace be upon him) whether there is a reward for me if I spend oh Abu Salama's sons, and I am not going to abandon them in this state (of helplessness) for they are my sons. He (the Holy Prophet) said: Yes. For you is the reward for what you spend on them.