When a Muslim is unsure about the permissibility of a financial transaction, they should assess the situation by consulting Islamic scholars or trusted sources knowledgeable in Islamic finance, refer to the Quran and Hadith for guidance, and consider the principles of Shariah, such as avoiding *riba* (interest), *gharar* (excessive uncertainty), and *haram* (forbidden) activities. If uncertainty remains, it’s best to err on the side of caution and avoid the transaction.