NASAI-KUBRA 4938:
from Nāfiʿ —
[Machine] The Messenger of Allah ﷺ said, "Whoever frees a portion of a person, he is responsible to free what remains. If he does not have money, then he is allowed to do what he can."
الكبرى للنسائي ٤٩٣٨:
عن نافع —
قَالَ رَسُولُ اللهِ ﷺ «مَنْ أَعْتَقَ نَصِيبًا فِي إِنْسَانٍ كُلِّفَ عِتْقَ مَا بَقِيَ فَإِنْ لَمْ يَكُنْ لَهُ مَالٌ فَقَدْ جَازَ مَا صَنَعَ»