Sunan an-Nasa'i 4568
سنن النسائي#4568SahihIt 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Lighairihi
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 44:120