Clad in all-white 'Ahram' and chanting 'Talbiah', the faithful, irrespective of their colour, caste, or nationality, performed the Waqoof-e-Arafat, the main Haj ritual.
They listened to the 'Khutba-e-Haj' before combining their Zohar and Asr prayers at Masjid-e-Nemra, in Maidan-e-Arafat.
Crowding on to Mount Arafat, worshippers prayed and joined in the hypnotic chant in Arabic: "O God, I am in Thy presence again, there is no presence like thine presence, to you is the praise, the power and domain, there is no equal to you."
Authorities in Saudi Arabian kept special security and vigil to ensure comfortable and unhindered transfer of pilgrims from Mina to Arafat.
Airborne helicopters were a reminder this year's pilgrimage takes place amid heightened security.
Some 5,000 security forces have been deployed in and around Makkah to maintain security and control the mass of pilgrims.
While in Muzdalifa for the night, pilgrims on Sunday will throw stones at three pillars in Mina.
They will, later, assembled at Makkah al Mukarrama to perform 'Tawaf' and offer sacrifice of animals in commemoration of Sunnat-e-Ibrahimi.