I bought Barira (a female slave). The Prophet ﷺ said (to me), "Buy her as the Wala' is for the manumitted." Once she was given a sheep (in charity). The Prophet ﷺ said, "It (the sheep) is a charitable gift for her (Barira) and a gift for us." Al-Hakam said, "Barira's husband was a free man." Ibn ʿAbbas said, 'When I saw him, he was a slave."  

النَّبِيُّ ﷺ اشْتَرِيهَا فَإِنَّ الْوَلاَءَ لِمَنْ أَعْتَقَ وَأُهْدِيَ لَهَا شَاةٌ فَقَالَ هُوَ لَهَا صَدَقَةٌ وَلَنَا هَدِيَّةٌ قَالَ الْحَكَمُ وَكَانَ زَوْجُهَا حُرًّا وَقَوْلُ الْحَكَمِ مُرْسَلٌ وَقَالَ ابْنُ عَبَّاسٍ رَأَيْتُهُ عَبْدًا  

The Prophet ﷺ said, "The Wala' is for the manumitted (of the slave).  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّمَا الْوَلاَءُ لِمَنْ أَعْتَقَ