Ibn ‘Umar said he used to sell camels at an-Naqi‘for dinars and take dirhams for them, and sell for dirhams and take dinars for them. He went to the Prophet and mentioned that to him, and he replied, “There is no harm in taking them at the current rate so long as you do not separate leaving something still to be settled.” Tirmidhi, Abu Dawud, Nasa’i and Darimi transmitted it.