From Sahih Bukhari (Hadith 5369):
Narrated Um Salama:I said, "O Allah's Messenger (ﷺ)! Shall I get a reward (in the Hereafter) if I spend on the children of Abu Salama and do not leave them like this and like this (i.e., poor) but treat them like my children?" The Prophet said, "Yes, you will be rewarded for that which you will spend on them
Reference: Bukhari 5369