Al-Kāfi - Volume 5 > Advance Payment for Buying Slaves and Animals
Hadith #14

14- مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنْ قُتَيْبَةَ الأعْشَى قَالَ سُئِلَ أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) وَأَنَا عِنْدَهُ فَقَالَ لَهُ رَجُلٌ إِنَّ أَخِي يَخْتَلِفُ إِلَى الْجَبَلِ يَجْلِبُ الْغَنَمَ فَيُسْلِمُ فِي الْغَنَمِ فِي أَسْنَانٍ مَعْلُومَةٍ إِلَى أَجَلٍ مَعْلُومٍ فَيُعْطِي الرَّبَاعَ مَكَانَ الثَّنِيِّ فَقَالَ لَهُ أَبِطِيبَةِ نَفْسٍ مِنْ صَاحِبِهِ فَقَالَ نَعَمْ قَالَ لا بَأْسَ‏.

14. Muhammad ibn ‘Isma’il has narrated from al-Fadl ibn Shadhan from Safwan ibn Yahya from Qutaybah al-’A‘sha’ who has said the following: “Once abu ‘Abd Allah, ‘Alayhi al-Salam, was asked, when I was present, by a man who said, ‘My brother comes from and goes to the mountains, milks sheep of known age for an appointed time; then he is given four years old in place of three years old.’ He (the Imam) asked, ‘Is it with fine consent of his party?’ he replied, ‘Yes, it is so.’ He (the Imam) said, ‘It is not unlawful.’”