(46) باب بَيْعِ الدِّرْهَمِ بِالدِّرْهَمِ
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 enjoined upon us."
Reference: Sunan an-Nasa'i 4568
In-book reference: Book 44, Hadith 120
English translation: Vol. 5, Book 44, Hadith 4572