Perfecting and Completing Islam - Ramadan Reflections 29

The Prophet worked hard for 23-years – in Mecca and Medina – and brought  a faith to the Quraysh and the world a ‘new religion’ which would  feature teachings such as: Monotheism, Prophethood, and the Day of  Resurrection. In addition, he brought the practical rulings of praying,  fasting, pilgrimage, charity and many more. Was Islam “complete” and  “perfect” with these teachings or was there something else “missing”  that had to be declared AGAIN on a MASSIVE SCALE? What happened before  the death of Prophet Muḥammad after his farewell hajj in the event known  as Ghadeer Khumm?