Chapter on Sales
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 11
وَ رَوَى إِسْحَاقُ بْنُ عَمَّارٍ عَنْ أَبِي اَلْعُطَارِدِ قَالَ: قُلْتُ لِأَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ رَجُلٌ يَشْتَرِي اَلطَّعَامَ فَيَتَغَيَّرُ سِعْرُهُ قَبْلَ أَنْ يَقْبِضَهُ قَالَ "إِنِّي لَأُحِبُّ أَنْ يَفِيَ لَهُ كَمَا أَنَّهُ لَوْ كَانَ فِيهِ فَضْلٌ أَخَذَهُ".
Ishaq ibn Ammar narrated from Abu Al-Utard who said: I asked Abu Abdillah عليه السلام about a man who purchases food, and its price changes before he takes possession of it. Imam عليه السلام said: "I prefer that he honors the agreement (at the original price), just as he would have taken the benefit if there had been an increase in value."
- Ṣaḥīḥ al-Faqīh, p. 220