فضائل بر الوالدين
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "No son can repay the kindness of his father unless he finds him a slave and buys him and emancipates him."
عن أبي هريرة -رضي الله عنه- قال: قال رسول الله -صلى الله عليه وسلم-: «لاَ يَجْزِي ولدٌ والدًا إلا أن يجده مملوكًا، فَيَشْتَرِيَهُ فَيُعْتِقَهُ».
شرح الحديث :
The son can never repay his father for all the good he has done or fulfill all the rights his father has over him, except if the father was a slave and the son emancipated him by buying him (from his master) and setting him free.