Al-Kāfi - Volume 5 > Marriage with Slave Girls
Hadith #2

2- مُحَمَّدُ بْنُ يَحْيَى عَنْ عَبْدِ اللهِ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ عِيسَى بْنِ أَبِي مَنْصُورٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ لا بَأْسَ بِأَنْ يَتَزَوَّجَ الأمَةَ مُتْعَةً بِإِذْنِ مَوْلاهَا.

2. Muhammad ibn Yahya has narrated from ‘Abd Allah ibn Muhammad from Ali ibn al-Hakam from Aban ibn ‘Uthman from ‘Isa ibn abu Mansur who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘It is not unlawful to marry a slave-girl in the manner of al-Mut‘ah (advantageous marriage) by the permission of her master.’”