١- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ عَلِيِّ بْنِ أَبِي حَمْزَةَ عَنْ أَبِي بَصِيرٍ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنِ السَّلَمِ فِي الْحَيَوَانِ قَالَ لَيْسَ بِهِ بَأْسٌ قُلْتُ أَرَأَيْتَ إِنْ أَسْلَمَ فِي أَسْنَانٍ مَعْلُومَةٍ أَوْ شَيْ‏ءٍ مَعْلُومٍ مِنَ الرَّقِيقِ فَأَعْطَاهُ دُونَ شَرْطِهِ وَفَوْقَهُ بِطِيبَةِ أَنْفُسٍ مِنْهُمْ فَقَالَ لا بَأْسَ بِهِ.
1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Ali ibn abu Hamzah from abu Basir who has said the following: “This is concerning my question before abu ‘ Abd Allah , about the case of advance payment in buying animals. He (the Imam) said, ‘It is not unlawful.’ I then asked him (the Imam) if I can make an advance payment for known years or something known like slaves and I pay more or less than his stipulation with consent and happiness. He (the Imam) said, ‘It is not unlawful.’” 