It depends on the country he is going to. The consulate of the country he is immigrating to can direct you, either they can attest a sworn statement at the consulate or direct you to a lawyer recommended by the embassy.
Hello, my friend is filling an immigration form. He has to declare that his statements are not false and this declaration has to be witnessed by a 'Commissioner of Oaths' - as per that form's instruction.
Who can one approach in UAE to get such a form attested?