سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 4568
The Book of Financial Transactions
Selling Dirhams For Dirhams
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، عَنْ حُمَيْدِ بْنِ قَيْسٍ الْمَكِّيِّ، عَنْ مُجَاهِدٍ، قَالَ قَالَ ابْنُ عُمَرَ الدِّينَارُ بِالدِّينَارِ وَالدِّرْهَمُ بِالدِّرْهَمِ لاَ فَضْلَ بَيْنَهُمَا هَذَا عَهْدُ نَبِيِّنَا صلى الله عليه وسلم إِلَيْنَا .
It was narrated that Mujahid said: "Umar said: Dinar for Dinar, Dirham for Dirham, no difference between them, this is the obligation that our Prophet (ﷺ) enjoined upon us."
Sunan an-Nasa'i, 4568Sahih (Darussalam)