gulam chowdhury , 24 , quoted verses from the quran before stabbing mohammed yasser afzal 20 times in the east london mini cab office .
the old bailey heard that mr afzal had been involved in a relationship with chowdhury and mr riaz for several weeks before the murder , but kept both relationships .
the court heard ms riaz had been dating both chowdhury and mr afzal in the weeks before the murder .