What is the ruling on depositing cash in Egyptian banks in an Islamic transaction account, with the intention of preserving and investing it and supporting the national economy, given that these banks employ these funds in national projects and distribute profits to depositors?

Preserving and investing wealth and supporting the national economy are good intentions, but one must seek out lawful means and avoid prohibited ones. The ruling on Islamic transaction branches of interest-based banks depends on their adherence to Sharia (definition) guidelines and their independence from the original branches. If these conditions are met, then it is permissible to invest money with them; otherwise, it is not.