"I came to the Prophet and said: 'Wait, I want to ask you something. I sell camels in Al-Baqi with a price set in Dinars but I accept Dirhams instead.' He said: 'There is nothing wrong with it if you take the price on that day, still unfinished business between you both (buyer and seller)"'  

أَتَيْتُ النَّبِيَّ ﷺ فَقُلْتُ رُوَيْدَكَ أَسْأَلُكَ إِنِّي أَبِيعُ الإِبِلَ بِالْبَقِيعِ بِالدَّنَانِيرِ وَآخُذُ الدَّرَاهِمَ قَالَ لاَ بَأْسَ أَنْ تَأْخُذَ بِسِعْرِ يَوْمِهَا مَا لَمْ تَفْتَرِقَا وَبَيْنَكُمَا شَىْءٌ