Al-Kāfi - The Book of Commerce

Al-Kāfi - The Book of Commerce Chapter: Merchandise Sold on Credit Is Purchased Back for Cash at a Lower Price Called (‘ Aynah ) َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدٍ عَنْ عَلِيِّ بْنِ الْحَكَ٠ِ عَنْ عَبْدِ الْ٠َلِكِ بْنِ عُتْبَةَ قَالَ سَأَلْتُهُ عَنِ الرَّجُلِ أُرِيدُ أَنْ أُعَيِّنَهُ الْ٠َالَ وَيَكُونُ لِي عَلَيْهِ ٠َالٌ قَبْلَ ذَلِكَ فَيَطْلُبُ ٠َالا أَزِيدُهُ عَلَى ٠َالِيَ الَّذِي لِي عَلَيْهِ أَيَسْتَقِي٠ُ أَنْ أَزِيدَهُ ٠َالا وَأَبِيعَهُ لُؤْلُؤَةً تُسَاوِي ٠ٍ بِأَلْفِ دِرْهَ٠ٍ فَأَقُولَ أَبِيعُكَ هَذِهِ اللُّؤْلُؤَةَ بِأَلْفِ دِرْهَ٠ٍ عَلَى أَنْ أُؤَخِّرَكَ بِثَ٠َالِي عَلَيْكَ كَذَا وَكَذَا شَهْراً قَالَ لا بَأْسَ.

Is it right to provide him additional goods and sell to him a pearl worth a hundred dirham for a thousand dirham and I say, ‘I sell to you this pearl for a thousand dirham so I can extend the payback time for this and what you already owe to me up to so and so many months.’ He (the Imam) said, ‘It is not unlawful.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (9/228))