Al-Kāfi - Volume 5 > Separation of Slaves from their Relatives (Is Not Permissible)
Hadith #4

4- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْعَبَّاسِ بْنِ مُوسَى عَنْ يُونُسَ عَنْ عَمْرِو بْنِ أَبِي نَصْرٍ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) الْجَارِيَةُ الصَّغِيرَةُ يَشْتَرِيهَا الرَّجُلُ فَقَالَ إِنْ كَانَتْ قَدِ اسْتَغْنَتْ عَنْ أَبَوَيْهَا فَلا بَأْسَ.

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-‘Abbas ibn Musa from Yunus from ‘Arm ibn abu Nasr who has said the following: “This is concerning my question before abu ‘Abd Allah, ‘Alayhi al-Salam, if one can buy a small slave-girl. He (the Imam) said, ‘If she is independent of her parents, it is not unlawful.’”