HOW TO REPAY ONE'S FATHER H 313 "No son can repay his father unless he finds a slave, buys him and then frees him." R 313 Muslim with a chain up to Abu Hurairah who related that the Prophet, praise and peace be upon him, said this.
313- وعن أَبي هريرة رضي الله عنه ، قَالَ : قَالَ رَسُول الله صلى الله عليه وآله وسلم : "لا يَجْزِي وَلَدٌ وَالِداً إلاَّ أنْ يَجِدَهُ مَمْلُوكاً ، فَيَشْتَرِيهُ فَيُعْتِقَهُ" رواه مسلم .