Is it permissible to sell euros such that their price is delivered in Libyan dinars to the seller's brother in Libya, with a time difference between receiving the amount and delivering the euros?

It appears that the sale occurred, and then they agreed to take possession of the two countervalues later. This did not fulfill the condition of possession at the session of the contract, which is a requirement for the validity of currency exchange (sarf). Ibn al-Mundhir said: "All those whom we preserve knowledge from among the people of knowledge have unanimously agreed that if the two parties exchanging currencies separate before taking possession, then the exchange is invalid." Since the exchange is invalid, the contracting parties must return what they took. If they wish to proceed, they should conduct a valid exchange by taking possession at the session of the contract.