"And on the heir is incumbent the like of that..." Sahih al-Bukhari 5369
Arabic hadith text
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا وُهَيْبٌ، أَخْبَرَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ زَيْنَبَ ابْنَةِ أَبِي سَلَمَةَ، عَنْ أُمِّ سَلَمَةَ، قُلْتُ يَا رَسُولَ اللَّهِ هَلْ لِي مِنْ أَجْرٍ فِي بَنِي أَبِي سَلَمَةَ أَنْ أُنْفِقَ عَلَيْهِمْ، وَلَسْتُ بِتَارِكَتِهِمْ هَكَذَا وَهَكَذَا، إِنَّمَا هُمْ بَنِيَّ. قَالَ " نَعَمْلَكِ أَجْرُ مَا أَنْفَقْتِ عَلَيْهِمْ "
Translation
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."