Al-Kāfi - Volume 5 > Rent From Tenant and His Responsibilities
Hadith #3

3- أَحْمَدُ بْنُ مُحَمَّدٍ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عَلِيِّ بْنِ إِسْمَاعِيلَ بْنِ عَمَّارٍ عَنْ عُبَيْدِ بْنِ زُرَارَةَ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) الرَّجُلُ يَأْتِي الرَّجُلَ فَيَقُولُ اكْتُبْ لِي بِدَرَاهِمَ فَيَقُولُ لَهُ آخُذُ مِنْكَ وَأَكْتُبُ لَكَ [بَيْنَ يَدَيْهِ] قَالَ فَقَالَ لا بَأْسَ قَالَ وَسَأَلْتُهُ عَنْ رَجُلٍ اسْتَأْجَرَ مَمْلُوكاً فَقَالَ الْمَمْلُوكُ أَرْضِ مَوْلايَ بِمَا شِئْتَ وَلِي عَلَيْكَ كَذَا وَكَذَا دَرَاهِمَ مُسَمَّاةً فَهَلْ يَلْزَمُ الْمُسْتَأْجِرَ وَهَلْ يَحِلُّ لِلْمَمْلُوكِ قَالَ لا يَلْزَمُ الْمُسْتَأْجِرَ وَلا يَحِلُّ لِلْمُلُوكِ.

3. Ahmad ibn Muhammad has narrated from ibn abu ‘Umayr from Ali ibn ‘Isma’il ibn ‘Ammar from ‘Ubayd ibn Zurarah who has said the following: “This is concerning my question before abu ‘Abd Allah, ‘Alayhi al-Salam, about the case of a man who comes to another man and says, ‘Write for me for a few dirham.’ He says, ‘I take from you and write (in your presence).’ He (the Imam) said, ‘It is not unlawful.’ I then asked about a man who hires a slave who says, ‘Make my master agree for whatever amount you like but so and so much dirham will be for me’, if this becomes binding upon the employer and if it is lawful for the slave. He (the Imam) said, ‘It does not become binding upon the employer and it is not lawful for the slave.’”