Chapter on Currency Exchange and Its Forms
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 29
رُوِيَ عَنْ عُمَرَ بْنِ يَزِيدَ قَالَ: قُلْتُ لِأَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ اَلدَّرَاهِمُ بِالدَّرَاهِمِ فِي إِحْدَاهُمَا رَصَاصٌ وَزْناً بِوَزْنٍ قَالَ أَعِدْ فَأَعَدْتُ عَلَيْهِ ثُمَّ قَالَ أَعِدْ فَأَعَدْتُ عَلَيْهِ فَقَالَ "لاَ أَرَى بِهِ بَأْساً".
It is narrated from Umar ibn Yazid, who said: I asked Abu Abdullah عليه السلام about exchanging dirhams for dirhams, where one of them contains lead, but they are equal in weight. Imam عليه السلام said: "Repeat the question." So I repeated it to him. Then Imam عليه السلام said: "Repeat it again." I repeated it again, and Imam عليه السلام said: "I see no harm in it."
- Ṣaḥīḥ al-Faqīh