AT 9.50pm tomorrow a plane will leave Sydney carrying Sheikh Mansour Leghaei, two hours and 10 minutes before his deadline to leave the country voluntarily - or be deported. As many as 500 Muslims and Christians will gather tonight to farewell Dr Leghaei, the Iranian Shiite preacher who has raised his four children in Sydney for the past 16 years, but who ASIO has accused of undisclosed ''acts of foreign interference''.