Stoning the Uqbah pillar
After completing his stay in Muzdalifa, the pilgrim moves to Mina (which is 6 k.m. from Muzdalifa) for doing the obligatory rituals of that day. These obligations are three: stoning the ‘Uqbah Pillar, then sacrificing the animal, and then shaving of the head or taqsir.
This is the fourth obligatory ritual of hajj after the ihram, the stay in ‘Arafat and Muzdalifa.