Al-Kāfi

Hadith 662
tradeusury
17- وَفِي حَدِيثٍ آخَرَ بِهَذَا الإسْنَادِ قَالَ الْمُخْتَلِفُ مِثْلانِ بِمِثْلٍ يَداً بِيَدٍ لا بَأْسَ.
17. In another Hadith through the same chain of narrators as that of the previous Hadith it is narrated thatexchange of two different kinds of goods at the same time is not harmful.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī