Al-Kāfi

Hadith 1782
temporary-marriage
1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عُمَرَ بْنِ أُذَيْنَةَ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ قُلْتُ كَمْ تَحِلُّ مِنَ الْمُتْعَةِ قَالَ فَقَالَ هُنَّ بِمَنْزِلَةِ الإمَاءِ.
1. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from ‘Umar ibn ‘Udhaynah who has said the following: “This is concerning my question before abu ‘ Abd Allah (a.s.), about how many are lawful for al-Mut‘ah (advantageous marriage). He (the Imam) said, ‘Their case is similar to slave-girls.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī