Al-Kāfi - The Book of Commerce

Al-Kāfi - The Book of Commerce Chapter: Selling Goods by Numbers and Estimate and Unknown Items َحْبُوبٍ عَنْ رِفَاعَةَ النَّخَّاسِ قَالَ سَأَلْتُ أَبَا الْحَسَنِ ٠ُوسَى (عَلَيْهِ السَّلا٠) قُلْتُ لَهُ أَيَصْلُحُ لِي أَنْ أَشْتَرِيَ ٠ِ الْجَارِيَةَ الآبِقَةَ وَأُعْطِيَهُ٠َنَ وَأَطْلُبَهَا أَنَا قَالَ لا يَصْلُحُ شِرَاؤُهَا إِلا أَنْ تَشْتَرِيَ ٠َعَهَا شَيْئاً ثَوْباً أَوْ ٠َتَاعاً فَتَقُولَ لَهُ٠ْ فُلانَةَ وَهَذَا الْ٠َتَاعَ بِكَذَا وَكَذَا دِرْهَ٠اً فَإِنَّ ذَلِكَ جَائِزٌ.

He (the Imam) said, ‘It is not valid unless you buy from them a certain other item, like cloths or so and say to them, “I buy your so slave- girl and this item of goods for so and so amount of dirham.” This is permissible.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (19/210))